Huh. Gosh. Sort of anti-green.

I can see this getting a lot of play. "I tap my land, and sweep it, drawing a lot of cards to try and find a game-winner I can cast with it!"

I was worried that this is anti-green. It'd be weird to see a red or black creature having a "sac a forest" ability though.

­Goblin Clearcutter and Dark Heart of the Wood gives some precedent.

But then, Elven Palisade, Foratog and a few more give precedent for it in pure green too.

So I guess either is fine. But you probably want to add either an activation cost, or a tap, or both.

It's kinda fun as is. But I can see it with an additional activation cost of as well.