Spellstaff Infiltrator

Ninjutsu {2}{u}{r}
Prowess (Whenever you cast a noncreature spell,
this creature gets +1/+1 until end of turn.)
Whenever Spellstaff Infiltrator deals combat
damage to a player, you may cast an instant or
sorcery spell from your hand with mana cost
less than or equal to that damage without
paying its mana cost.