Opp has pw ability: “Fetch the first creature in your opponent’s library, and place it on the battlefield under your control”. Opp also has a support that does something similar.
I brought Ulrich (who can transform) and Gisela (who would be able to meld if I also had Bruna).
Every time I played the battle, my opponent would eventually summon the backs of my creature cards (or both the front and the back), making the battle significantly harder.
I don’t remember this happening the last time the event ran.

