Target creature gains indestructible until end of turn. (Then exile this card. You may cast the creature later from exile.)

Flying

Sorcerous Elixir — Whenever Tzaangor Shaman deals combat damage to a player, copy the next instant or sorcery spell you cast this turn when you cast it. You may choose new targets for the copy.

+2: Ugin, the Spirit Dragon deals 3 damage to any target.

−X: Exile each permanent with mana value X or less that's one or more colors.

−10: You gain 7 life, draw seven cards, then put up to seven permanent cards from your hand onto the battlefield.

When Ugin's Construct enters, sacrifice a permanent that's one or more colors.

Partner with Cazur, Ruthless Stalker (When this creature enters, target player may put Cazur into their hand from their library, then shuffle.)

Ukkima, Stalking Shadow can't be blocked.

When Ukkima leaves the battlefield, it deals X damage to target player and you gain X life, where X is its power.

When Uktabi Orangutan enters, destroy target artifact.

Devoid (This card has no color.)

Whenever you cast an Eldrazi spell, you may pay . If you do, copy all spells you control, then copy all other activated and triggered abilities you control. You may choose new targets for the copies. (Mana abilities can't be copied.)

When you cast this spell, target opponent exiles the top half of their library, rounded up.

Ward—Sacrifice two permanents.

Ulamog, the Defiler enters with a number of +1/+1 counters on it equal to the greatest mana value among cards in exile.

Ulamog has annihilator X, where X is the number of +1/+1 counters on it.

Annihilator 2 (Whenever this creature attacks, defending player sacrifices two permanents of their choice.)

Ulamog's Crusher attacks each combat if able.

Vigilance

Ward—Sacrifice a permanent with mana value 1 or greater.

: Create a 10/10 colorless Eldrazi creature token.

Devoid (This card has no color.)

When Ulamog's Reclaimer enters, you may put a card an opponent owns from exile into that player's graveyard. If you do, return target instant or sorcery card from your graveyard to your hand.

Whenever this creature transforms into Ulrich, Uncontested Alpha, you may have it fight target non-Werewolf creature you don't control.

At the beginning of each upkeep, if a player cast two or more spells last turn, transform Ulrich, Uncontested Alpha.

Squad (As an additional cost to cast this spell, you may pay any number of times. When this creature enters, create that many tokens that are copies of it.)

Other creatures you control get +1/+1.

Trample, haste

Other creatures you control get +1/+1 and have trample and haste.

Trample, haste

: Transform Ulvenwald Oddity.

Flying

Whenever Umara Raptor or another Ally you control enters, you may put a +1/+1 counter on Umara Raptor.

Enchant creature

Enchanted creature loses all abilities and is a Toy artifact creature with base power and toughness 0/2 in addition to its other types.

As long as enchanted creature is face down, it can't be turned face up.

Return target nonland permanent to its owner's hand. Surveil 1. (Look at the top card of your library. You may put it into your graveyard.)

Whenever you cast a permanent spell with a mana cost that contains , double the value of X.

Whenever you cast an instant or sorcery spell or activate an ability, if that spell's mana cost or that ability's activation cost contains , copy that spell or ability. You may choose new targets for the copy.

Return target creature card from your graveyard to the battlefield with a lifelink counter on it.

Unbreathing Horde enters with a +1/+1 counter on it for each other Zombie you control and each Zombie card in your graveyard.

If Unbreathing Horde would be dealt damage, prevent that damage and remove a +1/+1 counter from it.

Target creature's owner puts it on their choice of the top or bottom of their library.

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

As Unclaimed Territory enters, choose a creature type.

: Add .

: Add one mana of any color. Spend this mana only to cast a creature spell of the chosen type.

Flash (You may cast this spell any time you could cast an instant.)

Enchant creature

Enchanted creature gets +2/+2 and attacks each combat if able.

Target creature gets +3/+3 and gains flying until end of turn.

Whenever a Zombie you control enters, you may pay . If you do, return Unconventional Tactics from your graveyard to your hand.

Toxic 1 (Players dealt combat damage by this creature also get a poison counter.)

When Unctus's Retrofitter enters, up to one target artifact you control becomes an artifact creature with base power and toughness 4/4 for as long as Unctus's Retrofitter remains on the battlefield.

, Discard a card: Return Undead Gladiator from your graveyard to your hand. Activate only during your upkeep.

Cycling (, Discard this card: Draw a card.)

When Undercity Eliminator enters, you may sacrifice an artifact or creature. When you do, exile target creature an opponent controls.

, Sacrifice another creature: Put a +1/+1 counter on Undercity Necrolisk. It gains menace until end of turn. Activate only as a sorcery. (It can't be blocked except by two or more creatures.)

Renown 1 (When this creature deals combat damage to a player, if it isn't renowned, put a +1/+1 counter on it and it becomes renowned.)

: Regenerate Undercity Troll. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

Whenever Undercover Butler attacks the player with the most life or tied for most life, it can't be blocked this turn.

You may have Undercover Operative enter as a copy of any creature on the battlefield, except it enters with a shield counter on it if you control that creature. (If it would be dealt damage or destroyed, remove a shield counter from it instead.)

Menace (This creature can't be blocked except by two or more creatures.)

When Underdark Explorer enters, you take the initiative.

(: Add or .)

Underground Mortuary enters tapped.

When Underground Mortuary enters, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)

(: Add or .)

If damage would be dealt to Undergrowth Champion while it has a +1/+1 counter on it, prevent that damage and remove a +1/+1 counter from Undergrowth Champion.

Landfall — Whenever a land you control enters, put a +1/+1 counter on Undergrowth Champion.

Undergrowth Scavenger enters with a number of +1/+1 counters on it equal to the number of creature cards in all graveyards.

Vigilance

When Undermountain Adventurer enters, you take the initiative.

: Add . If you've completed a dungeon, add six instead.

Each nonland card in your graveyard has escape. The escape cost is equal to the card's mana cost plus exile three other cards from your graveyard. (You may cast cards from your graveyard for their escape cost.)

At the beginning of the end step, sacrifice Underworld Breach.

Underworld Charger can't block.

Escape—, Exile three other cards from your graveyard. (You may cast this card from your graveyard for its escape cost.)

Underworld Charger escapes with two +1/+1 counters on it.

Enchant land

Enchanted land has ", Pay 1 life: Draw a card."

Underworld Fires deals 1 damage to each creature and each planeswalker. If a permanent dealt damage this way would die this turn, exile it instead.

Underworld Rage-Hound attacks each combat if able.

Escape—, Exile three other cards from your graveyard. (You may cast this card from your graveyard for its escape cost.)

Underworld Rage-Hound escapes with a +1/+1 counter on it.

: Add one mana of any color. During your next untap step, as you untap your permanents, return Undiscovered Paradise to its owner's hand.

Flying

Sphinx spells you cast cost less to cast.

Whenever Unesh, Criosphinx Sovereign or another Sphinx you control enters, reveal the top four cards of your library. An opponent separates those cards into two piles. Put one pile into your hand and the other into your graveyard.

Draw three cards.

Adamant — If at least three blue mana was spent to cast this spell, scry 3.

Enchant creature

Enchanted creature gets +2/+2 and has trample and lifelink. (Damage dealt by the creature also causes its controller to gain that much life.)

Menace (This creature can't be blocked except by two or more creatures.)

Whenever Unforgiving One attacks, return target creature card with mana value X or less from your graveyard to the battlefield, where X is the number of modified creatures you control. (Equipment, Auras you control, and counters are modifications.)

2 — : Add . Spend this mana only to cast creature spells.

4 — At the beginning of combat on your turn, target noncreature artifact you control becomes a 4/4 artifact creature with flying until end of turn.

2 — 2/4

5 — 8/6