Most games claim to be a TCG when in fact they are simply CCGs. I know that isn’t easy to create an infrastructure where to allow the exchange between players. The only TCGs I know are (unfortunately) NFT games of dubious quality.
M:tG Online (NOT M:tG Arena) allows trading. It used to be the cheapest way to play Magic, but Arena killed that. (People used to go to MTGO to draft, which added a lot of cards to the ecosystem which were then traded away for additional draft entries. Now, people who just want to draft usually do so on Arena, so the influx of cards has largely dried up and cards are far more expensive in MTGO as a result.)
Interesting, old Mtg game better than new one. I was actually a pretty competitive EDH player on the table, maybe time to try MTGO. (Hope I can play it on linux since isn’t on Steam)
(Edit) Looks like a nightmare to get it works on Linux
Pokemon TCG Online had trading, but they replaced it with TCG Live, that doesn’t and is generally a worse product.
Skyweaver is pretty good but I have not played for a few months. Card skins (gold and silver borders) and stickers are nft so you can buy, sell or trade. Base cards are not tradable.
I have it on my phone. It’s honestly better than many mobile “games” but it’s far away from being a good game in my opinion.
I think a whole bunch of games made by Tops might fit into what you’re looking for. They kinda reskin the same thing for various audiences (Baseball, Hockey, Star Wars, etc).
I haven’t played in a while, but I remember pulling some really rare cards (only 3 others in the world), and then being able to trade them with other players for a bunch of lesser ones.
The reality is that any digital tcg that is also free to play can’t allow trading.
Any that do are NFT nonsense as they have to essentially force players to work to convert time into value.
Economics demand that value enter the system somehow, either through money or time.
The Yugioh Master Duel game you can at least dismantle or generate the cards you want or don’t want. So it’s like trading with a GameStop. So not the same but it’s something.
So just like hearthstone dusting? That system lead to rampant power powercreep to ensure that people would still be incenvised to buy new packs and not just coast on the free packs. Though if my memories of yugioh are still relevant powercreep (and very liberal use of banlists) is sort of already baked into the original game.