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When this creature dies, you may have target creature get -2/-2 until end of turn.

{1}{B}, Discard a card: Return this card from your graveyard to your hand. Activate only during your upkeep.
Cycling {1}{B}

{R}: This creature gets +1/-1 until end of turn.
Unearth {2}{B}

When this creature enters, create a 2/2 black Zombie creature token for each card named Undead Servant in your graveyard.

Zombie spells you cast cost {1} less to cast.
Zombie creatures you control get +2/+1.

Deathtouch
When Underbridge Warlock enters, you get a one-time boon with "At the beginning of your end step, if three or more creatures died this turn, each opponent loses 5 life and you gain 5 life."
At the beginning of your end step, if you have a boon, you mill three cards, draw a card, and lose 2 life.

Rat Tail — When this creature dies, create a Treasure token.

When this creature enters, you may sacrifice an artifact or creature. When you do, exile target creature an opponent controls.

{1}, 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.

{1}, Sacrifice another creature: Put a +1/+1 counter on this creature. It gains menace until end of turn. Activate only as a sorcery.

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

Target opponent discards a card. Then they may discard an additional card. If they don't, conjure a duplicate of a random card from their library into your hand. It perpetually gains "You may spend mana as though it were mana of any color to cast this spell."

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

{T}: Create a Treasure token. Activate only if a creature died this turn.

Fear
{B}: This creature gets +1/+1 until end of turn.

Target opponent sacrifices a creature of their choice. If you control a creature with power 4 or greater, you gain 4 life.

Underdark Beholder enters the battlefield with ten eyestalk counters on it.
If Underdark Beholder would be dealt damage, remove that many eyestalk counters from it instead. If you can't, sacrifice it.
Whenever Underdark Beholder attacks, reveal cards from the top of your library until you reveal an instant, sorcery, or enchantment card with converted mana cost less than the number of eyestalk counters on Underdark Beholder. You may cast it without paying its mana cost. Shuffle your library.

Menace
When this creature enters, you take the initiative.

Whenever an artifact you control enters, you may pay {1}. If you do, each opponent loses 1 life and you gain 1 life.
{1}{B}, Sacrifice this enchantment: Destroy target creature. Activate only if you control two or more artifacts.

{B}, {T}, Discard a card: Return target creature card from your graveyard to your hand.

This creature can't block.
Escape — {4}{B}, Exile three other cards from your graveyard.
This creature escapes with two +1/+1 counters on it.

Enchant land
Enchanted land has "{T}, Pay 1 life: Draw a card."

Whenever an opponent draws a card, this enchantment deals 1 damage to that player.

When this creature enters, create a number of 1/1 green Squirrel creature tokens equal to your devotion to black.