Spell thwart

Counter target spell. Instead of putting it into his or her Graveyard, your opponent returns the spell to his or her hand, then untaps up to X lands, where X is the converted Mana cost of the countered spell minus one.
Buyback: Discard a card at random.

"Ah, you have a Fireball then ? Good to know. Keep
it for later, will you ?"