At the end of an attack by this card that has 1 card with [Greymon] in its name and 1 card with [Garurumon] in its name in its digivolution cards, can I activate this card's [End of Attack] effect and play just the card with [Greymon] in its name from this Digimon's digivolution cards?
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No, you can't. If this card's [End of Attack] effect activates, you must play the specified cards whenever possible.
Source: EX9-021 Omnimon Alter-S