How does this card's "This Digimon can't attack players" effect work if this Digimon is affected by a "make 1 of your opponent's Digimon attack" effect from my opponent?
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Official Ruling
If there are targets that this Digimon can attack, such as an opponent's suspended Digimon, it will attack that target.If the only possible target is the opponent, no attack will occur because of the "This Digimon can't attack players" effect.
Source: ST14-04 Phascomon