Ghoulmon (BT25-076) - Dual Revolution Foil

When this card would be played, by deleting 1 of your play cost 11 or lower Digimon with [Negamon] in its digivolution cards and [Negamon] in its text, reduce the cost by the deleted Digimon's play cost.
[Rush] [Reboot] [Blocker]
[On Play] [When Attacking] [On Deletion] Delete 1 of your opponent's Digimon with the lowest play cost. If this effect didn't delete, trash your opponent's top security card.