Extremis Upgrade Tweet Played, limit 1 $0.15 / $0.18 credit Buy This Product Details Cost: 0 Set: Marvel: Universe Card Number: MUN-120 Rarity: Uncommon Illustrator: Adi Granov Card Text: Concealed-Optional. Equip only to Iron Man. If equipped character would become stunned, instead, you may KO Extremis Upgrade. If you do, exhaust equipped character. Legality: Golden Age, Silver Age, Modern Age, Random Punks Card Type: Equipment Finish: Regular