Deep Time Herald

Flash, flying, indestructible
Deep Time Herald cannot be sacrificed or exiled.
When Deep Time Herald enters the battlefield, reset players, then end the turn. (Life totals and hand sizes become their starting values, counters and emblems are lost, "for the rest of the game" effects end, and mana pools empty. Exile all spells and abilities on the stack, including this card. Damage wears off, and "this turn" effects end.)