The Extra Championship will follow the Extra Regulation, which allows all cards issued to date, with the exception of select prohibited cards
However, the type of core the cards have is often relevant as well
Keep excess cards that can be versatile, like spare Trainers Mails or Computer Search to maximize your chances of an uninterrupted lock
Scientists Atlantean Skirmisher Baron Helmut Zemo Baron Strucker, HYDRA Overlord Body Launderer Change of Plans Copycrook Cyclonus, the Saboteur / Cyclonus, Cybertronian Fighter Doc Ock's Henchmen Doctor Doom, King of Latveria Echo Inspector Hypnotic Grifter Illuminator Virtuoso Kamiz, Obscura Oculus Kang, Temporal Tyrant Leader, Super-Genius Ledger Shredder Lethal Scheme Madame Masque Mask of the Schemer Mechanical Mobster Mob Lookout M.O.D.O.K
Be aware that you cannot use this card in your inkwell so if you draw it early on it can just sit in your hand for several turns before being usable
Promotional cards are also integral to understanding card rarities because more often than not, a card will only be offered as part of a certain promotion
