Green Goblin

Intimidate, Shroud
When the Green Goblin enters the battlefield, all your opponent's creatures get -X/-X, where X is the amount of Swamps you control, and all your creatures gain +X/+X, where X is the amount of Forests you control.
Sacrifice a land: Create a 1/1 Pumpkin token. Sacrifice it, destroy target creature.
Harry's dead!