Which trade system fix would you prefer?

MegaMewtwoYex

The trading system is stuid, broken, greedy, useless and it makes the game being a 5/5 fun game to a 1/5 greedy trash app.

Having to litteraly burn all our nice cards to be able to trade one single card is completely stupid!

So there we are, what would be the best fix for this mess and of an update?

1. Keep the "sacrifice card" but make it one for one; you burn one EX, you can trade one EX, etc.
2. Remove the tokens completely, make it "XP based" the more you trade cards (starting with rarity 1 and 2), the more you gain XP and eventually you unlock rarity 3 and so on.
3. Remove the tokens completely, make it "friend level" dependant; the more you trade/battle with a friend, the more your friend level raises, the rarer the cards you can trade.
4. Give tokens when you trade low rarity; when you trade rarity 1 & 2, you gain X amount of token, when you traded enough you can trade a rarer card.

I'm all open to you ideas too!