First of all thanks for releasing such a cool game for free!
I've played for a few hours now and I've really enjoyed myself.
I'm not sure if I understand the 'sacrifice' mechanic though. Every time that I use it it takes -1 HP from the host, and seemly doesn't do anything for the recipient? It would be neat if the changes were highlighted.
I'm a big fan of low cost/free cards - Magikarp = GOAT wish one could buff it without increasing the cost.
Looking forward to supporting your future releases!