Pokmon, which partly owned by Nintendo, has seen a resurgence in the past few years, due in part to the popular Pokmon GO augmented reality game
I think with a little work we can improve on the information a little
After making two large bodies, Karn acts as a card advantage engine, fueling your critical mass of artifacts by giving you more artifacts and/or lands and constantly threatening to get you cards like Cranial Plating and Arcbound Ravager with its -1
Once all of the defence counters have been removed, the battle card transforms and whatever permanent is on the other side goes to the player who finished it off
Obviously, if this interaction works the way we think it should (we'll need the Thunder Junction release document to be sure) then Tibalt decks could become a major threat in the Modern MTG format once more (in which case expect this spike to get even more dramatic)
Who should be getting Wildcard bundle