A card digivolved into a card that has an [On Play] [When Attacking] [Once Per Turn] effect while "none of your opponent's Digimon can activate [On Play] effects" was activated. Does that count as an instance of that effect's [X Per Turn] even if that effect can't be activated upon the timing when that card is played?
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No, it doesn't count. The effect can't activate upon the [On Play] timing, therefore it doesn't count as an instance of that effect's [X Per Turn].
Source: BT20-037 Chaosmon: Valdur Arm