There aren't too many collectible card games on Linux, but here's something a bit like that. Though it comes with plenty of traditional turn-based strategy along with the cards. Let's see what's in it!
Argentine game developer Saibot Studios has released the the third chapter of Doorways on Steam and Desura, with Linux support from the go. The game is a continuation of Doorways 1 & 2, which is also available for Linux.