Death and Decay

Ultimate Spell — Debuff • Cost: 8

Give all an opponent's units and heroes -3/-3 this turn. Deal 3 damage to all their buildings.

Black • Disease Ultimate Magic

Card-Specific Rulings

Giving -3/-3 to an X/3 unit or hero will cause it to die (because it has 0 HP) even if it had armor. — Sirlin, 03/02/16