Cosmic Knowledge

Whenever you play an instant, or sorcery spell on
your turn, you may pay an extra {1}{u} to cast it.

If you do, that spell has rebound. (If a spell with
rebound was cast from your hand, instead of putting
it into your graveyard as it resolves, exile it and, at
the beginning of your next upkeep, you may cast that
card from exile without paying its mana cost.)