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

Whenever an artifact enters the battlefield under your control, you may pay . If you do, each opponent loses 1 life and you gain 1 life.

, Sacrifice Underhanded Designs: Destroy target creature. Activate only if you control two or more artifacts.

Vigilance

When Undermountain Adventurer enters the battlefield, you take the initiative.

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

Flash

Undersea Invader enters the battlefield tapped.

, , Discard a card: Return target creature card from your graveyard to your hand.

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.

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

Exile cards from the top of your library until you exile a nonland card. Undying Flames deals damage to any target equal to that card's mana value.

Epic (For the rest of the game, you can't cast spells. At the beginning of each of your upkeeps, copy this spell except for its epic ability. You may choose a new target for the copy.)

Enchant creature

Enchanted creature gets +2/+2 and can't block.

When Undying Rage is put into a graveyard from the battlefield, return Undying Rage to its owner's hand.

Up to three target creatures can't block this turn.

Flying

Sphinx spells you cast cost less to cast.

Whenever Unesh, Criosphinx Sovereign or another Sphinx enters the battlefield under your control, 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 two cards. Then you may exile an instant or sorcery card from your hand. If you do, search your hand and library for any number of cards with the same name, exile them, then shuffle. Seek an instant or sorcery card for each card exiled from your hand this way.

Shuffle your library, then reveal the top card. If it's a nonland card, you may cast it without paying its mana cost. If it's a land card, you may put it onto the battlefield and return Unexpected Results to its owner's hand.

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.)

Devoid (This card has no color.)

Draw three cards and create a 0/1 colorless Eldrazi Spawn creature token with "Sacrifice this creature: Add ."

Enchant creature

Enchanted creature gets +2/+2 and has trample and lifelink. (Damage dealt by a creature with lifelink 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.)

Unfriendly Fire deals 4 damage to any target.

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

When enchanted creature dies, return that card to the battlefield under your control.

Target player discards a card.

Draw a card.

Black legendary creatures you control have "bands with other legendary creatures." (Any legendary creatures can attack in a band as long as at least one has "bands with other legendary creatures." Bands are blocked as a group. If at least two legendary creatures you control, one of which has "bands with other legendary creatures," are blocking or being blocked by the same creature, you divide that creature's combat damage, not its controller, among any of the creatures it's being blocked by or is blocking.)

: Add .

, : Put target Zombie card from your graveyard on top of your library.

Destroy target creature.

Spell mastery — If there are two or more instant and/or sorcery cards in your graveyard, you gain 2 life.

Vigilance

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

First strike, haste

Equipped creature has first strike and haste.

Equip

Crew 1

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

Whenever a player casts a spell, that player may pay . If the player does, they draw a card.

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

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

2 — : Add one mana of any color.

3 — Whenever this creature attacks, if it's not a Brushwagg, it gets +X/+0 until end of turn, where X is the number of supertypes, card types, and subtypes it has.

2 — 5/1

4 — 4/8

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.

Double the power of target creature until end of turn.

Unleash the Inferno deals 7 damage to target creature or planeswalker. When it deals excess damage this way, destroy target artifact or enchantment an opponent controls with mana value less than or equal to that amount of excess damage.

: Exile up to two target cards from a single graveyard.

Unlicensed Hearse's power and toughness are each equal to the number of cards exiled with it.

Crew 2

: Target nonattacking, nonblocking creature gets +0/+2 until end of turn.

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

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

When Unlucky Witness dies, exile the top two cards of your library. Until your next end step, you may play one of those cards.

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.

You may exile a black card from your hand rather than pay this spell's mana cost.

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

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.

At the beginning of each combat, double the power and toughness of each creature you control until end of turn.

It becomes night. Until end of turn, target creature gets +1/+0 and gains trample and "Whenever this creature deals combat damage to a player, draw a card."

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