Choose target spell. If it's a creature spell, it perpetually gets -2/-0. Counter that spell unless its controller pays .

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

, Pay 1 life: Each opponent loses 1 life.

Whenever an opponent draws a card, Underworld Dreams deals 1 damage to that player.

Whenever Underworld Sentinel attacks, exile target creature card from your graveyard.

When Underworld Sentinel dies, put all cards exiled with it onto the battlefield.

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

, , Tap an untapped creature you control: Unerring Sling deals damage equal to the tapped creature's power to target attacking or blocking creature with flying.

Target nontoken creature you control gets +2/+0 and gains double team until end of turn. It also gains first strike until end of turn if it has the same name as another creature you control or a creature card in your graveyard.

Put a +1/+1 counter and a lifelink counter on target creature.

Put target nonland permanent into its owner's library just beneath the top X cards of that library.

Return target creature to its owner's hand.

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

Return target creature card from your graveyard to the battlefield, then return up to two target Aura and/or Equipment cards from your graveyard to the battlefield attached to that creature. (If the Auras can't enchant that creature, they remain in your graveyard.)

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

Enchant creature

Enchanted creature gets +2/+1.

Exile target attacking creature if its power is less than or equal to the number of Soldiers on the battlefield.

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

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

Support 2. (Put a +1/+1 counter on each of up to two target creatures.)

Untap each creature you control with a +1/+1 counter on it.

, , Sacrifice Universal Solvent: Destroy target permanent.

: Add .

, : Add one mana of any color.

Unleash Shell deals 5 damage to target creature or planeswalker and 2 damage to that permanent's controller.

Destroy target creature. If you control an artifact, Unlicensed Disintegration deals 3 damage to that creature's controller.

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

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

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color.)

Return up to two target creature cards from your graveyard to your hand.

Devoid (This card has no color.)

Target creature you control fights target creature an opponent controls. If the creature an opponent controls would die this turn, exile it instead.

Return target permanent card from your graveyard to your hand. Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Target creature gains haste until end of turn.

Enchant creature

When Unquenchable Thirst enters the battlefield, if you control a Desert or there is a Desert card in your graveyard, tap enchanted creature.

Enchanted creature doesn't untap during its controller's untap step.

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 the battlefield, target opponent exiles a card from their hand.

Equipped creature gets +3/+3 and has first strike.

Whenever a creature dealt damage by equipped creature this turn dies, you may exile that card. If you do, create a 2/2 black Zombie creature token.

Equip

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

: Target creature gains forestwalk until end of turn.

When Unshakable Tail enters the battlefield and at the beginning of your upkeep, surveil 1.

Whenever one or more creature cards are put into your graveyard from your library, investigate. (Create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card.")

, Sacrifice a Clue: Return Unshakable Tail from your graveyard to your hand.

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

Damage can't be prevented this turn. If this spell was kicked, it deals 5 damage to target player or planeswalker.

When Unstable Glyphbridge enters the battlefield, if you cast it, for each player, choose a creature with power 2 or less that player controls. Then destroy all creatures except creatures chosen this way.

Craft with artifact (, Exile this artifact, Exile another artifact you control or an artifact card from your graveyard: Return this card transformed under its owner's control. Craft only as a sorcery.)

Enchant creature

Enchanted creature gets +3/+3.

At the beginning of the upkeep of enchanted creature's controller, put a -1/-1 counter on that creature.

2 — : Switch this creature's power and toughness until end of turn.

4 — Whenever this creature attacks, it gets +5/+5 until end of turn.

2 — 3/2

3 — 2/7

Trample

Champion a Treefolk or Warrior (When this enters the battlefield, 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.

Return target spell or creature to its owner's hand.

Search your library for a basic land card, put that card onto the battlefield, then shuffle.

Unyaro Bee Sting deals 2 damage to any target.

When Up the Beanstalk enters the battlefield and whenever you cast a spell with mana value 5 or greater, draw a card.

First strike

Whenever you cast an instant or sorcery spell, Urabrask deals 1 damage to target opponent. Add .

: Exile Urabrask, then return it to the battlefield transformed under its owner's control. Activate only as a sorcery and only if you've cast three or more instant and/or sorcery spells this turn.

Haste

At the beginning of your upkeep, exile the top card of your library. You may play it this turn.

At the beginning of each opponent's upkeep, the next time they would draw a card this turn, instead they exile the top card of their library. They may play it this turn.

At the beginning of combat on your turn, put an oil counter on Urabrask's Forge, then create an X/1 red Phyrexian Horror creature token with trample and haste, where X is the number of oil counters on Urabrask's Forge. Sacrifice that token at the beginning of the next end step.

Kicker <I>(You may pay an additional </I><I> as you cast this spell.)</I>

When Urborg Emissary enters the battlefield, if it was kicked, return target permanent to its owner's hand.

, Sacrifice Urborg Mindsucker: Target opponent discards a card at random. Activate only as a sorcery.

Whenever Urborg Scavengers enters the battlefield 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 <I>(You may pay an additional </I><I> as you cast this spell.)</I>

: Regenerate Urborg Skeleton.

If Urborg Skeleton was kicked, it enters the battlefield 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.

Destroy target Spirit or enchantment.

: Add .