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I've experienced several game hangs when activating one of the abilities of Warden of the First Tree, especially the second one (from Human Warrior to Human Spirit Warrior).

In the attached screenshot I was activating its second ability when the game did completely hang and the magic.exe process started to occupy 100% of a CPU core.

I think this has been fixed here in commit - fixed subtypes in 2bdf14c: viewtopic.php?f=112&t=31459&p=253632&hilit=Warden+of+the+First+Tree#p253667 , however I will retest when I have a dev environment working again.

I can cycle through its abilities with no problem in dev
Really sorry for the long delay between updates, everyone. I'm working a lot on the backend so we can have the cards interact much better and with fewer errors.