Rimestone Roilshaper

{t}: Creatures opponents control get -2/-0 until end of turn and creatures you control get +1/+1 until end of turn.
{2}: Scry 1. You may exile that card. If you do, target land becomes a 0/0 Elemental creature with X +1/+1 counters on it, where X is the converted mana cost of the exiled card. It's still a land.