Trample Goblin Mutant can't attack if defending player controls an untapped creature with power 3 or greater. Goblin Mutant can't block creatures with power 3 or greater.
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Goblin Mutant
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Creature — Goblin Mutant
Trample Goblin Mutant can't attack if defending player controls an untapped creature with power 3 or greater. Goblin Mutant can't block creatures with power 3 or greater.