In episode 92, right before Sergei appears, Barrett leaves a line saying, "Brave warrior, if there is still hope for you...", but Sergei appears right after that, making me wonder if he was aiming for this(...)
The game does however feature the exclusive Maximum Monsters, which are sets of three matching Monster Cards that, when gathered in the hand, can be Summoned to the field in "Maximum Mode", where they are treated as a single powerful monster whose ATK is represented by the "Maximum ATK" value on the central card
destroy it, and if you do, inflict damage to your opponent equal to half the destroyed monsters ATK
In the case of Diabellstar, when we say we want to talk about the building blocks of a potentially-powerful new deck releasing in Age of Overlord, we do mean the building blocks