Poison the World

When enchanted artifact gets put into the graveyard deal 2 damage to target creature you control and give it +2/+0, when this creature enters the graveyard from combat repeat the procedure for another target creature, if no creatures remain deal 3 damage to target opponent and place it on a creature target opponent controls, it gets -1/-1. When this creature enters the graveyard from battle put it on another creature target opponent controls.