My opponent's BT20-037 [Chaosmon: Valdur Arm]'s [When Digivolving] effect is preventing my [On Play] effects from activating. When this card attacks or my Digimon digivolves into it, can I use its [On Play] [When Digivolving] [When Attacking] to place a card from my hand or trash as this Digimon's top digivolution card, then activate the placed card's [On Play] effect?
Show ruling
Official Ruling
You can place the card, but you can't activate any of its [On Play] effects.