A new support card for Flip Decks (under the Subterror name) reveals itself.
SAST-JP077 サブテラーの継承 Subterror no Keishou (Subterror Succession)
Normal Trap Card
You can only activate a card with this card’s name once per turn. Activate 1 of these effects, also, after that, Set this card face-down instead of sending it to the Graveyard.
• Send 1 monster (either face-up that you control or in your hand) to the GY, and if you do, add 1 Flip Monster with the same Attribute but a different name than that card from your Deck to your hand.
• Send 1 Flip Monster (either face-up that you control or in your hand) to the GY, and if you do, add 1 monster with the same Attribute but a lower original Level than the sent monster from your Deck to your hand.