Yogg-Saron, Hope's End

Eminence—Whenever a player casts an instant or sorcery spell, exile that card with a yogg counter
on it instead of putting it into their graveyard as
it resolves.
When Yogg-Saron, Hope's End enters the battlefield, cast all cards in exile with yogg
counters on them in a random order without
paying their mana costs and with random targets.
This spell can't be countered.