Glimpse the Inevitable

Choose a card you own from outside the
game with mana value 5 or less and exile it
face up or face down. You may look at and
play that card for as long as it remains
exiled. If you exiled it face up, you may cast
it any time you could cast an instant by
paying {4}{u}{u} rather than paying its mana
cost. If you do, it can't be countered.