All Sliver creatures have poisonous 1. (Whenever a Sliver deals combat damage to a player, that player gets a poison counter. A player with ten or more poison counters loses the game.)

, : Untap target artifact.

Search your library for a permanent card with converted mana cost X or less, put it onto the battlefield, then shuffle your library.

Equipped creature gets +3/+1.
Equip (: Attach to target creature you control. Equip only as a sorcery.)

Changeling (This card is every creature type.)

Whenever you cast a spell that's both black and green, Woodlurker Mimic has base power and toughness 4/5 until end of turn and gains wither until end of turn. (It deals damage to creatures in the form of -1/-1 counters.)