Great Maelstrom (BT12-102) - Across Time

When you would use this card from your hand, by placing 1 of your blue Digimon as the bottom digivolution card of 1 of your other blue Digimon, reduce the cost by 3.
[Main] Return 1 of your opponent's Digimon to the bottom of its owner's deck.

[Security] Activate this card's [Main] effect.