Unhallowed Cathar can't block.

Unhallowed Phalanx enters tapped.

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.

Flying

When Unidentified Hovership enters, exile up to one target creature with toughness 5 or less.

When Unidentified Hovership leaves the battlefield, the exiled card's owner manifests dread.

Crew 1

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

Choose five. You may choose the same mode more than once.

• Target permanent phases out.

• Target player draws a card.

• Exile target player's graveyard.

• Unite the Coalition deals 2 damage to any target.

• Destroy target artifact or enchantment.

Changeling (This card is every creature type.)

: Add .

, : Add one mana of any color.

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.

Choose a card name. Search target opponent's graveyard, hand, and library for up to four cards with that name and exile them. That player shuffles, then draws a card for each card exiled from their hand this way.

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

Target creature gets +1/+1 and gains trample until end of turn.

: Choose a creature type other than Wall. Target creature becomes that type until end of turn.

Enchant creature

When Unquestioned Authority enters, draw a card.

Enchanted creature has protection from creatures.

2 — Whenever this creature attacks, bolster 1. (Choose a creature with the least toughness among creatures you control and put a +1/+1 counter on it.)

4 — Indestructible

2 — 3/2

3 — 5/4

When Unscrupulous Contractor enters, you may sacrifice a creature. When you do, target player draws two cards and loses 2 life.

Plot (You may pay and exile this card from your hand. Cast it as a sorcery on a later turn without paying its mana cost. Plot only as a sorcery.)

Each player mills three cards. Then you return up to two creature cards from your graveyard to your hand. (To mill three cards, a player puts the top three cards of their library into their graveyard.)

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.

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

When Unstoppable Ogre enters, target creature can't block this turn.

Return target creature to its owner's hand.

Choose one —

• Destroy target artifact.

• Change the target of target spell or ability with a single target.

• One or two target creatures can't block this turn.

: Regenerate Unworthy Dead.

Flying

: Unyaro Bees gets +1/+1 until end of turn.

, Sacrifice Unyaro Bees: It deals 2 damage to any target.

Put target land on top of its owner's library.

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.

Enchant land

Enchanted land has "Untap this land during each other player's untap step."

Draw three cards. You may play an additional land this turn.

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

Flying

Urborg Drake attacks each combat if able.

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

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

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.

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

Return target creature card from your graveyard to your hand. You gain 2 life. If this spell was kicked, return another target permanent card from your graveyard to your hand.

Other black creatures get -1/-1.

At the beginning of each player's upkeep, if that player controls a nonblack, nonland permanent, Urborg Stalker deals 1 damage to that player.

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

Draw a card.

Each land is a Swamp in addition to its other land types.

Target creature gets -3/-3 until end of turn. You may tap any number of untapped Vampire creatures you control. If you do, put a +1/+1 counter on each of those Vampires.

As an additional cost to cast this spell, collect evidence X, where X is the total mana value of the permanents this spell targets.

Destroy up to one target artifact, up to one target creature, up to one target enchantment, and up to one target planeswalker.

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.)

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 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.")