Counter target spell. Clash with an opponent. If you win, at the beginning of your next main phase, you may add an amount of
![Colorless](/Handlers/Image.ashx?size=small&name=C&type=symbol)
equal to that spell's mana value.
(Each clashing player reveals the top card of their library, then puts that card on the top or bottom. A player wins if their card had a higher mana value.)