報いの時
ソーサリー
召集（あなたのクリーチャーが、この呪文を唱える助けとなる。この呪文を唱える段階であなたがタップした各クリーチャーは、
かそのクリーチャーの色のマナ１点を支払う。）
トークンでないクリーチャーをすべて破壊する。
「ラヴニカは垣根のように刈り揃えられねばなりません。青く揃った葉だけを残せばいいのです。」 ――セレズニアの福音者、ニシュカ
イラスト：
GRN Guild Kit#104レア日本語適正
裁定
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.
Tapping an untapped creature that's attacking or blocking to convoke a spell won't cause that creature to stop attacking or blocking.
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. Convoke doesn't change a spell's mana cost or mana value.
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.
Because convoke isn't an alternative cost, it can be used in conjunction with alternative costs.
Tapping a multicolored creature using convoke will pay for or one mana of your choice of any of that creature's colors.