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Rules Text
Counter target spell. Clash with an opponent. If you win, at the beginning of your next main phase, you may add 
to your mana pool, where X is that spell’s converted mana cost. (Each clashing player reveals the top card of his or her library, then puts that card on the top or bottom. A player wins if his or her card had a higher converted mana cost.)
to your mana pool, where X is that spell’s converted mana cost. (Each clashing player reveals the top card of his or her library, then puts that card on the top or bottom. A player wins if his or her card had a higher converted mana cost.)