Bane of the Living (LGN 60)

Creature — Insect • Mana cost: {2}{B}{B} • Legions • Rare

Morph {X}{B}{B} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)
When this creature is turned face up, all creatures get -X/-X until end of turn.

Illustrated by Justin Sweet.