Unsanctioned

Legendary Creature — Human Gamer

{4}: Search your library for a card, put that card into your hand, then shuffle.

Johnny, Combo Player

Coldsnap

Snow Creature — Bird

Flying
Rimefeather Owl's power and toughness are each equal to the number of snow permanents on the battlefield.
{1}{S}: Put an ice counter on target permanent.
Permanents with ice counters on them are snow.

Rimefeather Owl

Snow Creature — Zombie

{1}, Sacrifice a creature: You gain 2 life.

Gutless Ghoul

Saviors of Kamigawa

Creature — Spirit

{3}{U}, {T}: Counter target spell unless its controller pays {2}.
Channel — {3}{U}, Discard this card: Counter target spell unless its controller pays {4}.

Ghost-Lit Warder

When this creature enters, return target creature to its owner's hand.
Whenever you cast a Spirit or Arcane spell, you may return this creature to its owner's hand.

Kiri-Onna

Champions of Kamigawa

{1}: Look at the top card of your library.
{2}: Reveal the top card of your library. If it's a land card, this creature gets +1/+0 and gains flying until end of turn. Activate only once each turn.

Callous Deceiver

Artifact

At the beginning of your upkeep, you may have target creature you control get +X/+X until end of turn, where X is the number of creatures you control. If you do, sacrifice that creature at the beginning of the next end step.