Basilisk Jungle

({t}: Add {g} to your mana pool.)
At the beginning of your end step, if you control three other Forests and Basilisk Jungle
isn't a creature, you may put three +1/+1 counters on it. If you do it becomes a 0/0 green Dragon creature with defender and flying. It's still a land.
Copses, reasonably safe. Thickets, probably fine. Groves, begin to worry me. Don't go near a wood!