Amiro, the banished blade

if a card would be cast you may pay {p/c} where {p/c} is the converted Mana cost of the spell casted. If this cost is paid, target card does not resolve and is exiled instead.
If cards were exiled by this ability this turn, before combat exile Amiro, the banished blade until the next upkeep. If this card is exiled return into your hand.