Syndra, Bloodbraid Mystic

First strike, prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of
turn.)
Spells you cast with converted mana cost equal to Syndra, Bloodbraid Mystic's power have cascade.
(When you cast the spell, exile cards from the top of
your library until you exile a nonland card that costs
less. You may cast it without paying its mana cost.
Put the exiled cards on the bottom of your library in
a random order.)