Aliva, Dean of Nullification

{t}, Exile a nonland card from your
graveyard: Counter target spell that shares
a card type with the exiled card unless its
controller pays {x}, where X is the mana
value of the exiled card. If a spell is
countered this way, exile it instead of
putting it into its owner's graveyard.
Then you may draw a card. If you do,
discard a card.