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19/03/21

If 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.

19/03/21

You 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.

05/10/18

Tapping a multicolored creature using convoke will pay for or one mana of your choice of any of that creature’s colors.

05/10/18

When 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.

05/10/18

You can tap an untapped creature you haven’t controlled continuously since the beginning of your most recent turn to convoke a spell.