Take the Calamity Box (If the Calamity Box is not in play, create a placeholder card named Calamity Box with "At the beginning of your first main phase, add three mana of any color in your commander’s color identity." and "Whenever a creature deals combat damage to you, its controller Takes the Calamity Box.")

Tap all creatures your opponents control and creatures you control get +3/+0 until the end of your next turn.