Creature — Goblin Warrior
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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 this creature attacks, it gets +1/+0 until end of turn for each other attacking Goblin.
Although Goblin Rabblemaster doesn't force itself to attack, if you control two of them, they'll force each other to attack if able.