Leain, Aspect of Wilderness

Unless you control a creature with three power
or more that entered the battlefield from a
library this turn, Leain isn't a creature.
{g}: Reveal the top card of your library.
You may put a creature card revealed this way
onto the battlefield. It fights target creature an
opponent controls.
Whenever a creature enters the battlefield, Leain
gains trample and +1/+1 untill end of turn.