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Mana Leak [Duel Decks: Speed vs. Cunning]
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| Set: | Duel Decks: Speed vs. Cunning |
| Type: | Instant |
| Rarity: | Common |
| Cost: | {1}{U} |
Counter target spell unless its controller pays {3}.
The fatal flaw in every plan is the assumption that you know more than your enemy.