Saint Petersburg
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Can you upgrade a card that is already an upgrade, or put a trading card over a card of another kind?
The rulebook says a trading card cannot displace another trading card and must match the colour it replaces.
- Saint Petersburg rulebook · Rulebook · The Trading Cards
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No. A trading card can only displace a card of the same colour that is not itself a trading card. Blue trading cards displace buildings, red displace aristocrats, and green displace the matching worker. A trading card can never displace another trading card, so once a card has been upgraded it stays for the rest of the game.