Boxing Day

Flying Whenever a player casts a nonblack spell, that player loses 1 life.

Wither (This deals damage to creatures in the form of -1/-1 counters.)

Search target player's library for up to X cards, where X is the number of Swamps you control, and exile them. Then that player shuffles.

When Endless Horizons enters the battlefield, search your library for any number of Plains cards, exile them, then shuffle. At the beginning of you...

Flying Wither (This deals damage to creatures in the form of -1/-1 counters.) Whenever Needle Specter deals combat damage to a player, that player ...

Target player discards a card. Retrace (You may cast this card from your graveyard by discarding a land card in addition to paying its other costs.)

Wither (This deals damage to creatures in the form of -1/-1 counters.) Whenever a creature an opponent controls with a -1/-1 counter on it dies, yo...

{T}: Target player exiles a card from their graveyard. Whenever you cast a black spell, you may untap Merrow Bonegnawer.

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.) Persist (When this creature dies, if it had no -1/-1 co...

At the beginning of your upkeep, destroy target creature with a -1/-1 counter on it.

{B/G}{B/G}: Exile target card from a graveyard. You gain 1 life.

Whenever Ashling, the Extinguisher deals combat damage to a player, choose target creature that player controls. The player sacrifices that creature.

{T}: Target red or green creature gets -2/-0 until end of turn.

Whenever a permanent you control becomes untapped, Wake Thrasher gets +1/+1 until end of turn.

Flying {U/R}: Talonrend gets +1/-1 until end of turn.

Create two 1/1 white Kithkin Soldier creature tokens. Retrace (You may cast this card from your graveyard by discarding a land card in addition to ...

Chroma — Reveal the top ten cards of your library. For each blue mana symbol in the mana costs of the revealed cards, target opponent mills a card....

{1}{U}, {T}: Return target creature with a counter on it to its owner's hand.

Target player draws a card. Retrace (You may cast this card from your graveyard by discarding a land card in addition to paying its other costs.)

{T}: Target creature gains flying until end of turn. Whenever you cast a blue spell, you may untap Merrow Levitator.

Return all nonblue creatures to their owners' hands.

Flying {U}: Target permanent becomes blue in addition to its other colors until end of turn.

{2}: Draw a card if you have no cards in hand.

Flying {U}, Sacrifice Glen Elendra Archmage: Counter target noncreature spell. Persist (When this creature dies, if it had no -1/-1 counters on i...