Trample, haste

: Transform Ulvenwald Oddity.

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Flying

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

Chroma — Umbra Stalker's power and toughness are each equal to the number of black mana symbols in the mana costs of cards in your graveyard.

Umbris, Fear Manifest gets +1/+1 for each card your opponents own in exile.

Whenever Umbris or another Nightmare or Horror you control enters, target opponent exiles cards from the top of their library until they exile a land card.

Companion — Each nonland card in your starting deck shares a card type. (If this card is your chosen companion, you may put it into your hand from outside the game for as a sorcery.)

As Umori, the Collector enters, choose a card type.

Spells you cast of the chosen type cost less to cast.

2 — When this permanent dies, return target noncreature, nonland card from your graveyard to your hand.

4 — Whenever this creature deals combat damage to a player, that player mills twice that many cards.

2 — 2/3

3 — 7/2

: Untap another target permanent.

Creatures you control gain indestructible until end of turn.

Addendum — If you cast this spell during your main phase, put a +1/+1 counter on each of those creatures and they gain vigilance until end of turn.

Enchant land

Enchanted land has ": Add one mana of any color."

Sacrifice Unbridled Growth: Draw a card.

Search your library for up to X creature cards with different names that each have mana value X, reveal them, put them into your hand, then shuffle.

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.)

Nontoken creatures you control have riot. (They enter with your choice of a +1/+1 counter or haste.)

If a creature you control with a +1/+1 counter on it would deal damage to a permanent or player, it deals double that damage instead.

Prevent all damage that would be dealt to Uncle Istvan by creatures.

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.

When Undead Butler enters, mill three cards. (Put the top three cards of your library into your graveyard.)

When Undead Butler dies, you may exile it. When you do, return target creature card from your graveyard to your hand.

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

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

Trample, haste

You may cast Undead Sprinter from your graveyard if a non-Zombie creature died this turn. If you do, Undead Sprinter enters with a +1/+1 counter on it.

You can't enter this dungeon unless you "venture into Undercity."

Secret Entrance — Search your library for a basic land card, reveal it, put it into your hand, then shuffle. (Forge, Lost Well)

Forge — Put two +1/+1 counters on target creature. (Trap, Arena)

Lost Well — Scry 2. (Arena, Stash)

Trap — Target player loses 5 life. (Archives)

Arena — Goad target creature. (Archives, Catacombs)

Stash — Create a Treasure token. (Catacombs)

Archives — Draw a card. (Throne of the Dead Three)

Catacombs — Create a 4/1 black Skeleton creature token with menace. (Throne of the Dead Three)

Throne of the Dead Three — Reveal the top ten cards of your library. Put a creature card from among them onto the battlefield with three +1/+1 counters on it. It gains hexproof until your next turn. Then shuffle.

, Sacrifice a creature: Target player reveals cards from the top of their library until they reveal a land card, then puts those cards into their graveyard.

Target player loses 1 life, discards a card, then sacrifices a permanent of their choice.

Cipher (Then you may exile this spell card encoded on a creature you control. Whenever that creature deals combat damage to a player, its controller may cast a copy of the encoded card without paying its mana cost.)

When Undercity Scavenger enters, you may sacrifice another creature. If you do, put two +1/+1 counters on Undercity Scavenger, then scry 2.

(: Add or .)

Undercity Sewers enters tapped.

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

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.)

Creatures you control gain deathtouch until end of turn. Then target creature you control fights target creature you don't control. (Each deals damage equal to its power to the other.)

Level up (: Put a level counter on this. Level up only as a sorcery.)

: Add .

LEVEL 1-7

: Add , , , or .

LEVEL 8+

: Add , , , or . Scry 1.

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.)

: Add .

, , Exile Underdark Rift: Roll a d10. Put target artifact, creature, or planeswalker into its owner's library just beneath the top X cards of that library, where X is the result. Activate only as a sorcery.

As an additional cost to cast this spell, you may pay .

Prevent all combat damage that would be dealt this turn. If this spell's additional cost was paid, this effect doesn't affect combat damage that would be dealt by red creatures.

At the beginning of your upkeep, return target land card from your graveyard to the battlefield tapped.

Undergrowth Stadium enters tapped unless you have two or more opponents.

: Add or .

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

When you unlock this door, surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)

(You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.)

Enchant land

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

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

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

Return target creature card with mana value 3 or less from your graveyard to the battlefield.

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

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.

As an additional cost to cast this spell, discard a card.

Draw two cards and create two Treasure tokens. (They're artifacts with ", Sacrifice this artifact: Add one mana of any color.")

Devoid (This card has no color.)

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

Unhallowed Cathar can't block.

2 — : You gain 1 life.

4 — Whenever this creature attacks, tap each creature an opponent controls with the same power and/or same toughness as this creature.

2 — 4/1

3 — 2/6

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.)

Unholy Heat deals 2 damage to target creature or planeswalker.

Delirium — Unholy Heat deals 6 damage instead if there are four or more card types among cards in your graveyard.

Vigilance

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

First strike, haste

Equipped creature has first strike and haste.

Equip

Crew 1

Converge — Create a 1/1 white Kor Ally creature token for each color of mana spent to cast this spell.