well. sometimes after a game they advertise bundles. I got a flash sale of $.99 for 550 gems, and then another one that was....$7.50 for the 1300 gem bundle (not much of a sale there, but cheap enough haha)
Wall knight is a very good hero. Anything that has access to Solar is automatically strong in my opinion because of the removal options and healing in solar. Wall knight only fall short because all of the guardian damage are in a high rarity, and solar doesn't provide a lot of great damage option (again, being the removal/healing attribute). If you get couple heavy hitters like tough beets and soul patch, wall knight is a super great hero in my opinion
