Phantom Demon Power Unleashed (BT24-054) - Beyond Generations

[Activate:Main] [Limit 1] If you have a blue "Hirudegarn" card in play : Choose up to 1 up to 1 of your opponent's Battle Cards with an energy cost of 3 or less and place it at the bottom of its owner's deck, then switch up to 1 of your mono-blue energy to Active Mode.