ゴブリンの熟練扇動者

毎ターン、あなたがコントロールしている他のゴブリン・クリーチャーは可能なら攻撃する。
あなたのターンの戦闘の開始時に、速攻を持つ赤の１/１のゴブリン・クリーチャー・トークンを１体生成する。
ゴブリンの熟練扇動者が攻撃するたび、ターン終了時まで、これは他の攻撃しているゴブリン１体につき＋１/＋０の修整を受ける。

Goblin Rabblemaster

Other Goblin creatures you control attack each combat if able.
At the beginning of combat on your turn, create a 1/1 red Goblin creature token with haste.
Whenever this creature attacks, it gets +1/+0 until end of turn for each other attacking Goblin.

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Other Goblin creatures you control attack each combat if able.
At the beginning of combat on your turn, create a 1/1 red Goblin creature token with haste.
Whenever Goblin Rabblemaster attacks, it gets +1/+0 until end of turn for each other attacking Goblin.

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Although Goblin Rabblemaster doesn't force itself to attack, if you control two of them, they'll force each other to attack if able.

If, during your declare attackers step, a creature that must attack if able is tapped, is affected by a spell or ability that says it can't attack, or hasn't been under your control continuously since the turn began (and doesn't have haste), then it doesn't attack. If there's a cost associated with having a creature attack, you're not forced to pay that cost, so it doesn't have to attack in that case either.

The number of attacking Goblins is counted as the last ability resolves, and the bonus is locked in at that time.