The Grand Calcutron can be your commander.

When The Grand Calcutron enters the battlefield, each player's hand becomes a program (an ordered row of revealed cards).

Players can only play the first card of their program.

If a card would be put into a player's hand from anywhere, that player reveals it and places it anywhere within their program instead.

At the beginning of each player's end step, if that player's program has fewer than five cards, they draw cards equal to the difference.

Exile target permanent, then put it into its owner's hand. That player discards that card, then puts it on top of their library. Then they put it onto the battlefield.

Flying, lifelink

Whenever The Haunt of Hightower attacks, defending player discards a card.

Whenever a card is put into an opponent's graveyard from anywhere, put a +1/+1 counter on The Haunt of Hightower.

When The Hourglass Coven enters the battlefield, draft a card from The Hourglass Coven's spellbook twice, then put those cards onto the battlefield.

Other Warlocks you control get +1/+1.

The Hunter Maze enters the battlefield tapped.

: Add .

, , Sacrifice The Hunter Maze: Draw a card.

Players can't activate planeswalkers' loyalty abilities.

At the beginning of your draw step, draw an additional card.

Spells you cast cost less to cast.

Creatures you control get +1/+1.

Myriad

The "legend rule" doesn't apply to creature tokens you control.

Triggered abilities you control can't cause you to sacrifice or exile creature tokens you control.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)

I — Return target instant card from your graveyard to your hand.

II — Return target sorcery card from your graveyard to your hand.

III — Until end of turn, whenever you cast an instant or sorcery spell, copy it. You may choose new targets for the copy.

When The Mouth of Sauron enters the battlefield, target player mills three cards. Then amass Orcs X, where X is the number of instant and sorcery cards in that player's graveyard. (Put X +1/+1 counters on an Army you control. It's also an Orc. If you don't control an Army, create a 0/0 black Orc Army creature token first.)

The Ring tempts you. Then reveal cards from the top of your library until you reveal X land cards, where X is the number of legendary creatures you control. Put those land cards onto the battlefield tapped and the rest on the bottom of your library in a random order.

This spell costs less to cast, where X is the greatest power among creatures you control.

Whenever one or more nontoken creatures you control die, create a green Fungus Dinosaur creature token with base power and toughness each equal to the total power of those creatures.

, : Double target creature's power until end of turn.

Visit — An opponent chooses "the fastest," "the scariest," or "the weakest." You choose a creature, then ask a person outside the game to choose the creature that best fits the chosen criteria. If they chose the same creature you chose, claim the prize

Prize — Create two 1/1 red Balloon creature tokens with flying, then sacrifice The Superlatorium and open an Attraction.

Lights — 2, 3, 6

Visit — An opponent chooses "the quietest," "the slowest," or "the ugliest." You choose a creature, then ask a person outside the game to choose the creature that best fits the chosen criteria. If they chose the same creature you chose, claim the prize

Prize — Create two 1/1 red Balloon creature tokens with flying, then sacrifice The Superlatorium and open an Attraction.

Lights — 2, 5, 6

Visit — An opponent chooses "the friendliest," "the smartest," or "the wildest." You choose a creature, then ask a person outside the game to choose the creature that best fits the chosen criteria. If they chose the same creature you chose, claim the prize

Prize — Create two 1/1 red Balloon creature tokens with flying, then sacrifice The Superlatorium and open an Attraction.

Lights — 3, 5, 6

The Surgical Bay enters the battlefield tapped.

: Add .

, , Sacrifice The Surgical Bay: Draw a card.

Target opponent reveals their hand. You choose a nonland card from it. That player discards that card.

Amass Orcs 2. (Put two +1/+1 counters on an Army you control. It's also an Orc. If you don't control an Army, create a 0/0 black Orc Army creature token first.)

(As this Saga enters and after your draw step, add a lore counter.)

I — For each opponent, destroy up to one target creature or planeswalker that player controls.

II — Each opponent discards three cards, then mills three cards.

III — Put all creature cards from all graveyards onto the battlefield under your control. Exile The True Scriptures, then return it to the battlefield (front face up).

, Discard a card: Create a Food token. (It's an artifact with ", , Sacrifice this artifact: You gain 3 life.")

, , Sacrifice The Underworld Cookbook: Return target creature card from your graveyard to your hand.

Create X tapped 2/2 black Necron Warrior artifact creature tokens, then you gain life equal to the number of artifacts you control. Exile Their Number Is Legion.

You may cast Their Number Is Legion from your graveyard.

Blue creatures don't untap during their controllers' untap steps.

At the beginning of each player's upkeep, that player may choose any number of tapped blue creatures they control and pay for each creature chosen this way. If the player does, untap those creatures.

Choose one —

• Target nonsnow permanent becomes snow until end of turn.

• Target snow permanent isn't snow until end of turn.

Draw a card at the beginning of the next turn's upkeep.

Flash

Whenever Thieves' Guild Enforcer or another Rogue enters the battlefield under your control, each opponent mills two cards.

As long as an opponent has eight or more cards in their graveyard, Thieves' Guild Enforcer gets +2/+1 and has deathtouch.

Flying

Thopter Squadron enters the battlefield with three +1/+1 counters on it.

, Remove a +1/+1 counter from Thopter Squadron: Create a 1/1 colorless Thopter artifact creature token with flying. Activate only as a sorcery.

, Sacrifice another Thopter: Put a +1/+1 counter on Thopter Squadron. Activate only as a sorcery.

Whenever you attack, investigate. (Create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card.")

Whenever you sacrifice a Clue, venture into the dungeon. (Enter the first room or advance to the next room.)

Flying

Your maximum hand size is reduced by four.

This spell can't be countered.

Target opponent reveals their hand. Exile all noncreature, nonland cards from that player's hand and graveyard.

Target opponent reveals their hand. You choose a nonland card from it. That player discards that card.

Surveil 1. (Look at the top card of your library. You may put it into your graveyard.)

Devoid (This card has no color.)

Flying

Whenever you cast a colorless spell, target opponent exiles the top card of their library.

Affinity for artifacts

Flying

When Thought Monitor enters the battlefield, draw two cards.

Imprint — When Thought Prison enters the battlefield, you may have target player reveal their hand. If you do, choose a nonland card from it and exile that card.

Whenever a player casts a spell that shares a color or mana value with the exiled card, Thought Prison deals 2 damage to that player.

Target player mills two cards.

Draw a card.

, : Target player loses 1 life and reveals their hand.

( represents colorless mana.)

When Thought-Knot Seer enters the battlefield, target opponent reveals their hand. You choose a nonland card from it and exile that card.

When Thought-Knot Seer leaves the battlefield, target opponent draws a card.

Constellation — Whenever Thoughtrender Lamia or another enchantment enters the battlefield under your control, each opponent discards a card.

First strike, vigilance

Champion a Kithkin (When this enters the battlefield, sacrifice it unless you exile another Kithkin you control. When this leaves the battlefield, that card returns to the battlefield.)

Thoughtweft Trio can block any number of creatures.

Untap Thousand Moons Infantry during each other player's untap step.

Whenever you cast an instant or sorcery spell, copy it for each other instant and sorcery spell you've cast before it this turn. You may choose new targets for the copies.

Trample

Whenever Thrakkus the Butcher attacks, double the power of each Dragon you control until end of turn.

Equipped creature gets +1/+1 for each Aura and Equipment attached to it and has ward . (Whenever equipped creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays .)

Equip (: Attach to target creature you control. Equip only as a sorcery.)

At the beginning of your upkeep, you may add . You can't spend this mana to cast spells.

Whenever Thrashing Mudspawn is dealt damage, you lose that much life.

Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Haste

Whenever Thraximundar attacks, defending player sacrifices a creature.

Whenever a player sacrifices a creature, you may put a +1/+1 counter on Thraximundar.

Search your library for up to four creature cards with different powers and reveal them. An opponent chooses two of those cards. Shuffle the chosen cards into your library and put the rest into your hand.

Target creature gets +1/+2 until end of turn.

Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Thriving Bluff enters the battlefield tapped.

As Thriving Bluff enters the battlefield, choose a color other than red.

: Add or one mana of the chosen color.

When Thriving Turtle enters the battlefield, you get (two energy counters).

Whenever Thriving Turtle attacks, you may pay . If you do, put a +1/+1 counter on it.

Distribute two +1/+1 counters among one or two target creatures. (Then exile this card. You may cast the creature later from exile.)

Thrull creatures get +1/+1.

: Gain control of target Thrull for as long as you control Thrull Champion.

Enchant creature

Enchanted creature gets +1/+1.

Sacrifice Thrull Retainer: Regenerate enchanted creature.