X'zzgal, Herald of the Void

Trample, Deathtouch
Whenever you cast an instant or sorcery spell you may pay life equal to the converted mana cost of the spell, if you do copy that spell. When X'zzgal attacks it gains +X/+0 where X is the amount of missing life of its controller, then create 1/1 black Rat Warrior creature tokens equal to X,zzgal's power.