If I would use this card's <Delay> effect to digivolve my Digimon, can it digivolve into a [Mineral] or [LIBERATOR] trait Digimon card?
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No, it can't. It can only digivolve into a card with both the [Mineral] and [LIBERATOR] traits.
Source: EX10-069 Unique Emblem: Gravel Hearts