Desperate Petition

Destroy all creatures.
Ritual- If a creature you control was dealt lethal combat damage this turn, you control no nonland, noncreature permanents, and you have no cards in hand, instead exile all creatures you don't control, then create a legendary enchantment token named "Holy Barrier" with "Creatures can't attack you or planeswalkers you control unless their controller pays {2} for each attacking creature."