Of course, in the days of internet access, plentiful set announcements and sites such as the one youre reading right now, no Secret Rare cards are ever really a surprise unless you avoid any spoilers on upcoming or recently released sets entirely, of course
We can now reveal the promotion will be largely themed around Dragon Pokemon
Most ideal starts involve a ramp effect by turn 2, whether that's a mana rock or a Rampant Growth effect
Anjelly and Hootcake both have effects that Special Summon a Madolche monster from the Deck with their respective costs that control the Graveyard, Petingcessoeur can Special Summon itself and Special Summons a Madolche monster from the Deck with its Level reduced by 1, and Magileine can act as a combo starter upon Normal Summon by searching out a Madolche monster from the Deck to the hand
During the End Phase, if this card is in the GY because it was sent there from the hand or field this turn: Add up to 3 "Harpie" cards with different names from each other from your Deck to your hand
It's reasonably strong even in an advantageous situation, but it shows its true potential in situations where the opponent has already deployed multiple, and can play an active role like a comeback trump card