We are developing Fatal Core as a full-featured trading card game, complete with competitive play, packs to open, and a player market to sell/buy cards. One thing Fatal Core will not have are purchases of any kind. We're hoping to offset some/all of the cost of development through Patreon eventually, with huge incentives for the whole community when certain donation tiers are reached. The game can be played in browser with no download, although it is not yet optimized for mobile.
For the interested:
Game link: https://fatalcoretcg.com/
Quick tutorial: https://imgur.com/bXtQskX
Discord (for easy matchmaking): https://discord.gg/augzm4n