Does this card's [All Turns] effect prevent me from playing a Digimon card with 6000 DP or less when my opponent has this Digimon while I have 1 or more memory?
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Official Ruling
Yes, it can't be played. If your opponent has this Digimon, "While your opponent has 1 or more memory" from your opponent's perspective means while you have 1 or more memory.