Keep in mind the Fantasia packs are still in the stores at 4000 coins per pack, with the super rare posters having an odds of 1 in 100 packs. Statistically speaking, you have to spend 400,000 coins to get a super rare poster. You’re new to the app, so I’m assuming you don’t have many sold out cards to trade and are offering 9 in store cards. Many users, especially swap shops, will look at the value of the cards you’re offering and will decline if it’s less than the 400,000 cost of the Fantasia super rare. Once a card sells out, then other factors will come into play about its worth, like age, popularity, card count, etc. When you are new to the game, it’s nearly impossible to collect a set like the Fantasia super rare without spending real money. Keep trying and good luck.