Sara, OPG's infernal Blade

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

{r/w}: Sara, OPG's infernal Blade gains first
strike until end of turn.

Whenever Sara deals combat damage, you
may cast a sorcery spell from your hand, with
mana value less than or equal to that damage
without paying its mana cost.