Mistveiled Cutthroat

Stealth (when a minion with stealth has a +1/+1 counter on it, it can't attack, it can't block, and it has shroud)
Mistveiled Cutthroat enter the battlefield with a +1/+1 counter on it.
Remove a +1/+1 counter from Mistveiled Cutthroat: Mistveiled Cutthroat gets +1/+0 and gains flying until end of turn.