Sunarizamon (Rare Pull) (BT21-055) - Dawn of Liberator Foil

[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.