Gallantmon (BT13-111) - Versus Royal Knights Foil

When you would play this card from the hand, if you have no Digimon, reduce the play cost by 2 for every 5 total cards in both players' trashes.
[Rush] (This Digimon can attack the turn it was played.)
[On Play] [When Digivolving] [When Attacking] Delete 1 of your opponent's Digimon with 6000 DP or less. If no opponent's Digimon was deleted by this effect, delete 1 of their Digimon with 13000 DP or more.