[Your Turn] When this Digimon would digivolve into a card with the [Mineral] or [Rock] trait, reduce the digivolution cost by 1.
[Rule] Trait: Has [Mineral] Type.

When effects trash this card from a [Mineral] or [Rock] trait Digimon's digivolution cards, delete 1 of your opponent's Digimon with a play cost of 4 or less.