Dedra Meero, ISB Prodigy

Whenever one or more creatures your opponents control attack you or a planeswalker you control,
look at that many cards from the top of that
player's library. Exile one of those cards
facedown.
You may look at cards exiled with Dedra Meero,
ISB Prodigy at any time. You may play cards
exiled with Dedra Meero and you may spend
mana as though it were mana of any color to
cast spells this way.