Quasar's Quirk

At the beginning of your upkeep, flip a coin.
If you win the flip, put a -1/-1 counter on Quasar's Quirk. If you lose the flip, put a
+1/+1 counter on it.

Whenever Quasar's Quirk attacks, you may
pay 2 life. If you do, choose one - Quasar's Quirk gains flying until end of turn; or
Quasar's Quirk gets +2/+0 until end of turn.