Mirasys, Savant of Nature

Trample, Forestwalk
Reuse(When this card dies, you may pay {g}{g}{g}.
If you do, add 5 green mana to your mana pool. You
don't lose this mana at the end of your turn)
Landfall — Whenever a land enters the
battlefield under your control, you may create a 4/4
Treant with trample. You can activate this ability
only twice per turn.