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

Undersea Invader enters tapped.

Underworld Cerberus can't be blocked except by three or more creatures.

Cards in graveyards can't be the targets of spells or abilities.

When Underworld Cerberus dies, exile it and each player returns all creature cards from their graveyard to their hand.

Constellation — Whenever Underworld Coinsmith or another enchantment you control enters, you gain 1 life.

, Pay 1 life: Each opponent loses 1 life.

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.

When Undying Beast dies, put it on top of its owner's library.

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.)

Unhallowed Phalanx enters tapped.

Vigilance

: Put a +1/+1 counter on Unholy Officiant.

Skulk (This creature can't be blocked by creatures with greater power.)

When Uninvited Geist deals combat damage to a player, transform it.

: Unliving Psychopath gets +1/-1 until end of turn.

, : Destroy target creature with power less than Unliving Psychopath's power.

: Target attacking Zombie gains lifelink until end of turn.

: Target attacking Zombie gains deathtouch until end of turn.

Trample

Whenever Unruly Krasis attacks, you may have the base power and toughness of another target creature you control become X/X until end of turn, where X is Unruly Krasis's power.

: Adapt 3. (If this creature has no +1/+1 counters on it, put three +1/+1 counters on it.)

When Unscrupulous Agent enters, target opponent exiles a card from their hand.

Forestwalk (This creature can't be blocked as long as defending player controls a Forest.)

: Target creature gains forestwalk until end of turn.

When Unsettling Twins enters, manifest dread. (Look at the top two cards of your library. Put one onto the battlefield face down as a 2/2 creature and the other into your graveyard. Turn it face up any time for its mana cost if it's a creature card.)

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

When Unstable Hulk is turned face up, it gets +6/+6 and gains trample until end of turn. You skip your next turn.

Trample

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

Whenever a creature you control becomes blocked, it gets +0/+5 until end of turn.

Deathtouch

Whenever Unstoppable Slasher deals combat damage to a player, they lose half their life, rounded up.

When Unstoppable Slasher dies, if it had no counters on it, return it to the battlefield tapped under its owner's control with two stun counters on it.

Trample

Other Wolves and Werewolves you control have trample.

: Put a +1/+1 counter on target creature.

Nightbound (If a player casts at least two spells during their own turn, it becomes day next turn.)

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

, Exile Unwilling Ingredient from your graveyard: You draw a card and you lose 1 life.

: Regenerate Unworthy Dead.

Flying

Sacrifice Unyaro Griffin: Counter target red instant or sorcery spell.

: Unyielding Krumar gains first strike until end of turn.

Upriser Renegade gets +2/+0 for each other modified creature you control. (Equipment, Auras you control, and counters are modifications.)

Creatures you control have haste.

Creatures your opponents control enter tapped.

When Urabrask's Anointer enters, it deals X damage to any target, where X is the number of permanents you control with oil counters on them.

When Urbis Protector enters, create a 4/4 white Angel creature token with flying.

: Add , , or .

Kicker and/or (You may pay an additional and/or as you cast this spell.)

As Urborg Lhurgoyf enters, mill three cards for each time it was kicked.

Urborg Lhurgoyf's power is equal to the number of creature cards in your graveyard and its toughness is equal to that number plus 1.

, Sacrifice Urborg Panther: Destroy target creature blocking Urborg Panther.

Sacrifice a creature named Feral Shadow, a creature named Breathstealer, and Urborg Panther: Search your library for a card named Spirit of the Night, put that card onto the battlefield, then shuffle.

Whenever Urborg Scavengers enters or attacks, exile target card from a graveyard. Put a +1/+1 counter on Urborg Scavengers.

Urborg Scavengers has flying as long as a card exiled with it has flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance.

Kicker (You may pay an additional as you cast this spell.)

: Regenerate Urborg Skeleton.

If Urborg Skeleton was kicked, it enters with a +1/+1 counter on it.

, , Discard a card: Each other player loses 2 life. You gain life equal to the life lost this way.

Flying

Whenever Urgoros, the Empty One deals combat damage to a player, that player discards a card at random. If the player can't, you draw a card.

When Uro enters, sacrifice it unless it escaped.

Whenever Uro enters or attacks, you gain 3 life and draw a card, then you may put a land card from your hand onto the battlefield.

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

: Ursine Champion gets +3/+3 and becomes a Bear Berserker until end of turn. Activate only once each turn.

Trample

At the beginning of combat on your turn, mill a card and choose an opponent at random. Ursine Monstrosity attacks that player this combat if able. Until end of turn, Ursine Monstrosity gains indestructible and gets +1/+1 for each card type among cards in your graveyard.

When Uruk-hai Berserker enters, the Ring tempts you.

When Urza, Lord High Artificer enters, create a 0/0 colorless Construct artifact creature token with "This creature gets +1/+1 for each artifact you control."

Tap an untapped artifact you control: Add .

: Shuffle your library, then exile the top card. Until end of turn, you may play that card without paying its mana cost.

Vigilance

, : Draw a card, then discard a card.

Whenever you discard one or more artifact cards, create a tapped Powerstone token. This ability triggers only once each turn. (The token is an artifact with ": Add . This mana can't be spent to cast a nonartifact spell.")

: Urza's Avenger gets -1/-1 and gains your choice of banding, flying, first strike, or trample until end of turn. (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding you control are blocking or being blocked by a creature, you divide that creature's combat damage, not its controller, among any of the creatures it's being blocked by or is blocking.)

: Roll a six-sided die. Urza's Science Fair Project gets the indicated result.

1 — It gets -2/-2 until end of turn.

2 — Prevent all combat damage it would deal this turn.

3 — It gains vigilance until end of turn.

4 — It gains first strike until end of turn.

5 — It gains flying until end of turn.

6 — It gets +2/+2 until end of turn.

Return target permanent you control to its owner's hand. (Then exile this card. You may cast the creature later from exile.)

At the beginning of your upkeep, put a spore counter on Utopia Mycon.

Remove three spore counters from Utopia Mycon: Create a 1/1 green Saproling creature token.

Sacrifice a Saproling: Add one mana of any color.

Flying

Whenever a Dragon you control attacks, create a 6/6 red Dragon creature token with flying.

Uurg, Spawn of Turg's power is equal to the number of land cards in your graveyard.

At the beginning of your upkeep, surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)

, Sacrifice a land: You gain 2 life.

Flying

, Return two lands you control to their owner's hand: Copy target instant or sorcery spell. You may choose new targets for the copy.

If it's neither day nor night, it becomes day as Vadrik, Astral Archmage enters.

Instant and sorcery spells you cast cost less to cast, where X is Vadrik's power.

Whenever day becomes night or night becomes day, put a +1/+1 counter on Vadrik.

Flying

At the beginning of your upkeep, sacrifice Vaevictis Asmadi unless you pay .

: Vaevictis Asmadi gets +1/+0 until end of turn.

: Vaevictis Asmadi gets +1/+0 until end of turn.

: Vaevictis Asmadi gets +1/+0 until end of turn.

: Regenerate target creature with power 5 or greater.