I Opened a Store in Marvel, and the Country Became the Purchaser

Lin Feng opened a card shop that only accepted gold or its equivalent and did not negotiate prices. On the first day, Tony Stark traded a watch for a pack of white cards. The next day, SHIELD agents came to the door and silently took out three pieces of gold. On the third day, a middle-aged man wearing casual clothes and walking calmly came in: "Store manager, the state wants to discuss the purchase price with you." The card pack contains super serum, steel armor, training techniques... But Lin Feng didn't care about this. All he knows is that the more goods he sells, the farther away he is from the mortal level.