Regalecusmon (BT10-027) - Xros Encounter

[When Digivolving] Trash the bottom 2 digivolution cards of 1 of your opponent's Digimon.
[When Attacking] If your opponent has a Digimon with no digivolution cards in play, you may play 1 level 3 Digimon card and 1 level 4 Digimon card from this Digimon's digivolution cards without paying their play costs.