Ravenous Cactus

Defender
Evolve (Whenever a creature enters the battlefield
under your control, if that creature has greater power
or toughness than this creature, put a +1/+1 counter
on this creature.)
As long as Ravenous Cactus's power is 3 or
greater, it has reach and "{t}: Ravenous Cactus
deals damage equal to its power to target creature
with flying."