Are you a tree?

Enchant target forest.
Enchanted forest has "{t}, Ask someone outside the game "are you a tree?" If they say yes, then bury their feet. If they say no, add {g}{g}{g} to your mana pool and target creature becomes a tree in addition to its others types. then, create a 3/3 green tree token with forestwalk and trample."
all your trees get +1/+4 and forest walk.