根の血族の同盟者

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、{1}かそのクリーチャーの色のマナ１点を支払う。）
あなたがコントロールするアンタップ状態のクリーチャーを２体タップする：ターン終了時まで、根の血族の同盟者は＋２/＋２の修整を受ける。

木身盟友

召集（此咒语能用你的生物来协助施放。你于施放此咒语时每横置一个生物，就能为此咒语支付{1}或一点该生物颜色之法术力。）
横置两个由你操控且未横置的生物：木身盟友得+2/+2直到回合结束。

Root-Kin Ally

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
Tap two untapped creatures you control: Root-Kin Ally gets +2/+2 until end of turn.

Modern Masters 2015

Ravnica: City of Guilds

Convoke (Each creature you tap while playing this spell reduces its cost by {1} or by one mana of that creature's color.)
Tap two untapped creatures you control: Root-Kin Ally gets +2/+2 until end of turn.

Because convoke isn't an alternative cost, it can be used in conjunction with alternative costs.

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.

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

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.

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.