Maelstrom [BT11-098] [Dimensional Phase]

[Main] You may play 1 blue Digimon card from one of your blue Digimon's digivolution cards without paying the cost. Then, if you have a Digimon with [Seadramon] in its name in play, return 1 of your opponent's level 4 or lower Digimon to the bottom of its owner's deck.