This card, [Takato Matsuki], and [Guilmon] are in [Gallantmon]'s digivolution cards. When that Digimon would leave the battle area other than by my effects, can I activate this card's inherited effect and play just 1 [Takato Matsuki] or 1 [Guilmon] from this card's digivolution cards?
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Official Ruling
No, you can't. You must play 1 [Takato Matsuki] and 1 [Guilmon] whenever possible.
Source: AD1-003 WarGrowlmon