The Highest Jeskai Council

Instants and sorcery cost {1} less to cast.
Whenever you cast an instant or sorcery from
your hand, as it resolves, exile it and return it to
battlefield face down as a 2/2 colorless creature
with no abilities and no creature type. You may
turn it up and cast it for its converted mana cost
any time you could cast an instant. If you would
cast an instant or sorcery from any other zone
than your hand, exile it as it revolves.