My opponent has Defense Grid and I have Vial Smasher the Fierce. On his turn i cast a 3 mana converted mana cost card. But with defense grid out I have to pay 6. So do I randomly do 6 dmg or 3 dmg?
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3. The ability will always deal deamage equal to the converted mana cost and doesn't care about how much mana is actually paid. Cards like Dig Through Time for example will deal 8 damage even though someone might have only paid two mana for it.
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