■ Over Drive — Darkness x1 Nature x1 (When you summon this creature , you may tap another 1 darkness and/or 1 nature card in your mana zone . If you do, this creature gets the following abilities.) Darkness : When you put this creature into the battle zone , choose one of your opponent 's creatures . That creature gets -2000 power until the end of the turn . Nature : When you put this creature into the battle zone , one of your creatures in the battle zone gets +2000 power until the end of the turn .