Calamity of Cinders
Sorcery
Oracle Text
Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for
or one mana of that creature's color.)
Calamity of Cinders deals 6 damage to each untapped creature.
Rules for this card
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A keyword ability that lets you tap creatures rather than pay mana to cast a spell. See rule 702.51, “Convoke.”
Rulings (6)
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Wizards of the CoastIf a creature you control has a mana ability with
in the cost, activating that ability while casting a spell with convoke will result in the creature being tapped before you pay the spell's costs. You won't be able to tap it again for convoke. Similarly, if you sacrifice a creature to activate a mana ability while casting a spell with convoke, that creature won't be on the battlefield when you pay the spell's costs, so you won't be able to tap it for convoke.
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Wizards of the CoastYou can tap any untapped creature you control to convoke a spell, even one you haven't controlled continuously since the beginning of your most recent turn.
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Wizards of the CoastTapping a multicolored creature using convoke will pay for or one mana of your choice of any of that creature's colors.
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Wizards of the CoastBecause convoke isn't an alternative cost, it can be used in conjunction with alternative costs.
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Wizards of the CoastWhen calculating a spell's total cost, include any alternative costs, additional costs, or anything else that increases or reduces the cost to cast the spell. Convoke applies after the total cost is calculated. Convoke doesn't change a spell's mana cost or mana value.
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Wizards of the CoastIf tapping a creature using convoke wouldn't pay for any mana in that spell's cost (because you've already paid for all of the mana in the spell's cost by tapping other creatures or because you've already paid for all of the generic mana in the cost by tapping other creatures and the creature you want to tap doesn't share a color with any of the remaining mana symbols in the spell's cost), you can't use convoke to tap that creature. Effects that increase or reduce the cost of a spell with convoke apply before costs are paid and will increase or decrease the total amount of creatures you can tap.