mtg.wtf

Whenever Undercover Butler attacks the player with the most life or tied for most life, it can't be blocked this turn.

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 Underdark Explorer 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 Underhanded Designs: 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.

Underworld Charger can't block.
Escape — {4}{B}, Exile three other cards from your graveyard.
Underworld Charger 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, Underworld Dreams deals 1 damage to that player.

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

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.

Target creature gains undying until end of turn.

Until end of turn, target creature gains "When this creature dies, return it to the battlefield tapped under its owner's control with a +1/+1 counter on it."

Return target creature card with mana value 3 or less from your graveyard to the battlefield.
Cycling {2}

{3}, {T}, 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.

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

Menace
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.

Spree
+ {2}{B} — Destroy target creature.
+ {1} — Create a 1/1 red Mercenary creature token with "{T}: Target creature you control gets +1/+0 until end of turn. Activate only as a sorcery."

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

Unhallowed Phalanx enters tapped.

Target player discards a card.
Draw a card.

At the beginning of your end step, draw a card. If you control a Demon, each opponent loses 2 life and you gain 2 life. Otherwise, you lose 2 life.

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

Enchant creature
When enchanted creature dies, return that card to the battlefield under your control with a +1/+1 counter on it.

Enchant creature
Enchanted creature gets +2/+1.