When synthesizing this list, I was looking at cards that are asymmetrical in their effect, hard to interact with, or have little ways to remove or stop them
Unfortunately, viewing the card descriptions can be tiring
9 Diaboromon The Mega-level virus villain from Digimon Adventure: Our War Game was first available as one of the promotional Digi-battle Card Game cards that could be obtained by purchasing a ticket for Digimon The Movie
During your Main Phase: You can Set 1 "Metalmorph" Trap from your Deck
Giving your opponent a card to make them attack somebody is too great a disadvantage, even if you get some mana
Temporal Forces is especially notable in the Pokmon TCG community for reintroducing what some may have thought was a new Pokmon card type: ACE SPECs, which are extremely powerful, one-off trainer cards