Entering the Trading Plaza
You need Rebirth 10 to access the Trading Plaza (or Rebirth 2 in some updates). Use Trade Tokens to value your cards. Remember, values fluctuate daily based on new pack releases.
Avoiding Scams
Always double-check the mutations on a card before accepting a trade. A base Legendary is worth far less than a Gold card with three mutations (Venomous + Bless + Rainbow).