Augurs of Bolas: Merfolk Wizards that worship Bolas. Judging by the definition of "augur" ((of an event or circumstance) portend a good or bad outcome), their ability of being able to retrieve instant and sorcery off the top of the library, and the their quote, there is no future save for the one my master wills, they likely have Precognition
Disciples of Bolas: Humans who worship Bolas. Judging by their ability to draw cards and gain life by sacrificing a creature, and their quote, Lord Bolas has shown me how each miserable little life holds untold resources, they can likely absorbminds and information
God-Pharoah's Faithful: Human disciples of Bolas who declare his return, and restore a little bit of life when their owner (Nicol Bolas) casts a blue, black, or red spell. More or less dead weight and fodder.
Aven Mindcensors: Avens (Bird people) who can literally censor thoughts that could pose a threat to Bolas. They can also fly
Mindclaw Shamans: Viashino (Lizard people) who are stated to be given power by Bolas because they would abuse it the most. They have the ability to read an opponents mind, and cast one of their spells without paying the mana cost.
The Immortal Sun: The Immortal Sun is an legendary artifact from Ixalan, initially used to try to trap Bolas. It can prevent planeswalkers from planeswalking away from the plane the Immortal Sun is on.
Planar Bridge: An artifact designed that allows inorganic material to travel to other planes. Any organic matter will be annihilated if it enters. The Bridge can absorb attacks and BFR them to different universes, as well as warp the Blind Eternities, creating new or warping chaotic life.
Interplanar Beacon: A beacon planted in Ravnica, used to lure planeswalkers to the plane when it goes off
Bolas's Citadel: A massive citadel Bolas sits upon. Presumably where he keeps all his harvested sparks.
Gate to the Afterlife and God-Pharaoh's Gift: When the worthy warriors of Amonkhet die by Hazoret's spear, they will be carried through the Gate to the Afterlife. There, they shall be covered in Lazotep, and become Eternals, a fierce undead warrior that serves Bolas
God-Pharaoh's Statue: A massive statue that Bolas shaped after himself. The statue serves no purpose but to enrage his enemies.
Throne of the God-Pharaoh: A throne that Bolas sits upon. Its purpose is purely unknown.
Crook of Condemnation: An object used to remove powers from others
Visage of Bolas: A inscription of Bolas. Its purpose is unknown.
Mask of Night's Reach: An artifact made by the Myojin of Night's Reach, in possession of Bolas prior to the mending. It allows the user to steal black-based powers
*Static Ability: Nicol Bolas has all loyalty abilities of all other planeswalkers on the battlefield.
+3: Destroy target noncreature permanent.
+3: Each opponent loses 3 life unless that player sacrifices a nonland permanent or discards a card.
+2: Target opponent exiles cards from the top of their library until they exile a nonland card. Until end of turn, you may cast that card without paying its mana cost.
+2: Draw two cards
+1: Each opponent exiles two cards from their hand.
+1: You draw a card. Each opponent exiles a card from their hand or a permanent they control.
-2: Gain control of target creature.
-3: Destroy target creature. Draw a card.
-3: Nicol Bolas deals 10 damage to target creature or planeswalker.
-3: Destroy target creature or planeswalker.
-4: Put target creature or planeswalker card from a graveyard onto the battlefield under your control.
-4: Nicol Bolas deals 7 damage to target opponent, creature an opponent controls, or planeswalker an opponent controls.
-8: Each opponent who doesn't control a legendary creature or planeswalker loses the game.
-9: Nicol Bolas deals 7 damage to target player or planeswalker. That player or that planeswalker's controller discards seven cards, then sacrifices seven permanents.
-11: Nicol Bolas deals 7 damage to each opponent. You draw seven cards.
-12: Exile each nonland permanent your opponents control.
-12: Exile all but the bottom card of target player's library.
Commence the Endgame
Tyrant's Scorn
Countersquall
Cower in Fear
Imp's Mischief
Mana Drain
Soul Manipulation
Commence the Endgame: A spell that can't be countered, draws you two cards and creates a zombie army equal to the number of cards in your hand. This is likely Bolas inevitably laying waste on Ravnica with his Dreadhorde army.
Tyrant's Scorn: A spell with two options: Return target creature to its owner's hand, or destroy target creature with mana value 3 or less. This is where Bolas resists and destroys the Blackblade, a weapon literally designed to kill him.
Countersquall: Counters a spell and makes the controller lose 2 life.
Cower in Fear: Creatures opponents control get -1/-1 until end of turn. This is a spell that makes opponents weaker and more terrified of Bolas.
Imp's Mischief: With the cost of some life, this spell allows Bolas to change the target of a spell.
Mana Drain: Counters a spell, absorbs the mana used to cast it for Bolas to use to use as his own
Soul Manipulation: As the name implies, Bolas can manipulate the souls of others, and can bring others to life or kill them, stating that both life and death are both easily reversible
The Elderspell
Spark Harvest
Conflux
Cruel Ultimatum
Dark Imitations
Crux of Fate
Deep Analysis
Hour of Devastation
Deliver Unto Evil
Tormenting Voice
Torment of Hailfire
Doomfall
Hour of Revelation
Magmaquake
Mastermind's Acquisition
Slave of Bolas
Apex of Power
Fraying Omnipotence
The Elderspell: An ancient spell used to help Bolas ascend to Godhood once more. Once used, it greatly amplifies the Dreadhorde and allows them to harvest sparks
Spark Harvest: When a Eternal kills a planeswalker, it will harvest their spark. Bolas will absorb this spark and become more powerful, a step closer to godhood.
Conflux:
Cruel Ultimatum:
Dark Imitations:
Crux of Fate:
Deep Analysis:
Deliver Unto Evil:
Hour of Devastation:
Tormenting Voice:
Torment of Hailfire:
Wit's End:
Doomfall:
Hour of Revelation:
Magmaquake:
Mastermind's Acquisition:
Slave of Bolas:
Apex of Power:
Fraying Omnipotence:
In Bolas's Clutches
Overwhelming
The Eldest Reborn
Blood Reckoning
Elder Mastery
Font of Agonies
Solemnity
Patient Rebuilding
In Bolas's Clutches:
Overwhelming Splendor:
The Eldest Reborn:
Blood Reckoning:
Elder Mastery:
Font of Agonies:
Solemnity:
Patient Rebuilding:
*A Reckoning Approaches:
Behold My Grandeur:
Chose Your Demise:
Delight in the Hunt:
Every Dream a Nightmare:
For Each of You, a Gift:
Know Evil:
Make Yourself Useful:
No One Will Hear Your Cries:
Pay Tribute to Me:
Power Without Equal:
The Mighty Will Fall:
There Is No Refuge:
This World Belongs to Me:
What's Yours Is Now Mine:
When Will You Learn?
*Because I Have Willed It:
Bow to My Command:
My Forces Are Innumerable:
My Laughter Echoes:
Other
Standard Tactics:
Weaknesses: Nicol Bolas is an extremely arrogant individual, having a massive god complex and believes to be entitled to having complete and utter dominion over the multiverse, viewing all others as nothing more than mere ants. Though he will not admit it, Bolas is absolutely terrified of the idea of lesser beings being able to kill those comparable to himself.
Trivia
Nicol Bolas may be based off of Satan himself. Take note that this isn't a panic-written theory, rather it's an interesting piece of trivia that could very well be coincidental.
"Nicol" is apparently the Medieval German name for the Devil, along with "Nicol" sounds like "Nick Ol'", which is a reference to "Ol' Nick/Old Nick", an old name for the Devil
"Bolas" is a potential reference to a demon from Ars Goetia known as Glasya-Labolas, who is the "President of Hell" who commands thirty-six leigons of demons.
Glasya-Labolas also tells all things past and to-come, being similar to Bolas reminiscing over his lost power and his plan to get it back.
Glasya-Labolas also gains the minds and love of friends of foes and can cause love among them if desired, which is similar to Bolas's theme of mass manipulation
Glasya-Labolas believes that homocide can make a man invisible, which is slightly similar of Bolas's idea that the innocent are weak and will pay for the crimes of the guilty (making them "invisible" to the law)
Bolas controlling an army known as the Dreadhorde, along with many other characters (The Gods of Amonkhet, Tezzeret, etc) may be a reference to Glasya-Labolas controlling thirty-six leigons of demons
Nicol Bolas's "parent", The Ur-Dragon is similar to that of god: A pridmorial being, and the Ur-Dragon is "the god of dragons"
Similary, Nicol Bolas's brother, Ugin, is similar to that of the Devil's brother, Jesus Christ. Both Ugin and Jesus are humble, martyrs, and both came back from the dead
Gallery
Gallery
Bolas's first appearance, in Legends
Nicol Bolas as he appears in From the Vault: Dragons
Bolas as he appears in Core Set 19
Bolas, as he appears as an Elder Dragon in a Judge Promo
Bolas upon ascending to becoming a planeswalker
As before, but Judge Promo
Nicol Bolas, as he returns to the story on Alara
Bolas as he appears in Duel Decks: Ajani vs Nicol Bolas
Bolas as he appears in Guilds of Ravnica Mythic Edition
Bolas returns in Hour of Devastation
Bolas as he appears in Archenemy: Nicol Bolas
Bolas as he appears in San Diego Comic-Con, where he turns the Gatewatch into hieroglyphics
The art of Bolas in the Planeswalker deck for starters
Bolas returing in War of the Spark, harvesting the sparks of the dying planeswalkers he trapped
"There can't possibly be Japanese art for Nicol Bo-"
War of the Spark Mythic Edition of Bolas
San Diego Comic-Can for Bolas as he appears in War of the Spark
Concept art for the Judge Promo for Nicol Bolas, the Arisen
Bolas as he appears in Duel Masters
Bolas battling Ugin
Bolas's god-like power fleeing
Bolas as he appears in the M13 banner
Bolas in the C19 banner
As before
Bolas killing everyone old enough to remember on Amonkhet
The Climax between Bolas's and Ajani's battle
Bolas standing triumphant over the Gatewatch
Bolas as he appears in the Hour of Devastation Banner
Bolas revealing to Liliana Vess that he is the actual broker of her contract, gaining control of her
Bolas standing in front of the planar bridge, where the Dreadhorde marches in
Bolas standing upon his citadel along with his four God-Eternals, right in front of all the planeswalkers summoned onto Ravnica