I use this card's [When Digivolving] effect to reveal cards from the top of my deck. If I reveal a 7-cost Option card, do I have to use it?
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Official Ruling
No, this card’s [When Digivolving] effect reads “you may,” so you can choose whether or not to use the Option card. If you don’t use it, you delete 1 of your opponent’s Digimon with a play cost of 4 or less.
