Gandalf of the Secret Fire

Whenever you cast an instant or sorcery spell from
your hand during an opponent’s turn, exile that
card with three time counters on it instead of put-
ting it into your graveyard as it resolves. Then if the
exiled card doesn’t have suspend, it gains suspend.

(At the beginning of your upkeep, remove a time
counter. When the last is removed, you may play
it without paying its mana cost.)