Garthan, Burner of Worlds

{t}: Deal X damage divided among
up to X targets, where X is the amount
of non-combat damage that has been
dealt to target player this turn.
- When you cast an instant or sorcery
spell that targets one or more opponents,
exile it with a flame counter on it instead
of putting it in your graveyard as it resolves.
- You may cast cards with flame
counters on it from exile