One of Formless Energy

Hexproof, Haste, Prowess 3 (Whenever you cast a noncreature spell, this creature gets +3/+3 until end of
turn.)
At the beginning of each player's end step, you
lose 3 life if you didn't cast a noncreature spell
this turn.
I can almost see its face. Each spell I cast sharpens its features, yet it fades with even a brief pause.
-Alla Nier