I feel like Magic The Gathering is too focused on milk the player base for profit. Especially MTG Arena. I am also sick of mana screw, over-powered card metas becoming the norm, etc.

Personally, I'd like to know if anyone is interested in FOSS game dev of a competing game that tries to replicate the aspect of MTG that are fun…but also addresses the mechanics and corporate-greed-caused issues.

Do you mean physical games like Yu-Gi-Oh and Pokémon, or digital games like Hearthstone or Runeterra?

I think competition is and has been alive and well in the TCG / CCG market. There are a mix of both huge companies and a ton of small businesses and hobby projects.