Nico Robin, Fugitive

At the beginning of each end step, put a Flower counter on Robin.
Remove X Flower counters from Robin:
Robin gets +X/+X until end of turn.
Remove 2 Flower counters from Robin:
Robin gains your choice of flying, trample,
first strike, lifelink, deathtouch, menace, or
vigilance until end of turn. Activate only as a
sorcery.