Lukamina, Moon Druid

{2}{g},{t}: Search your library for a green creature
card and exile it with a Wild Shape counter.
When Lukamina, Moon Druid attacks, exile it
and put target creature card you exiled with a
Wild Shape counter with power equal or lesser
than the highest mana value among creatures
you control onto de battlefield tapped and
attacking.
At the beginning of your end step, or if it would
leave the battlefield, exile it with a Wild Shape
counter and return Lukamina to the battlefield.