Kiln Fiend

Set
Conspiracy: Take the Crown
Rarity
Common
Text
Whenever you cast an instant or sorcery spell, Kiln Fiend gets +3/+0 until end of turn.
Legality
Legal in: Commander, Duel, Legacy, Modern, Pauper, Vintage
Rulings
2010-06-15: If you cast an instant or sorcery spell, Kiln Fiend’s ability triggers and goes on the stack on top of it. The ability will resolve before the spell does.