Zephyr Singer

Tapping a multicolored creature using convoke will pay for {1} or one mana of your choice of any of that creature's colors.

If a creature you control has a mana ability with {T} 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.

You can't tap more creatures to convoke Zephyr Singer than is necessary to pay for the spell. In most cases, this means four creatures. However, if there are any additional costs to cast Zephyr Singer, you may use convoke to pay those additional costs as well.