Really like the game.
I do have a couple points of criticism (hopefully constructive), though.
-Some of the campaign matches that have objects on them can be "cheesed" with sacrifice mechanics. One example is the Marching Stones and the Demonologist spell that does 25 damage to the lane opponent by sacrificing your creature.
-AI doesn't seem to want to "chump" dangerous creatures like the fire avatar. It just loses really fast to things like that.
-Some match objects that are supposed to be immune to spells are still vulnerable to "comes into play" effects like the fire wall doing 5 damage to enemy creatures.
-Purely opinion, but I think the hasted drakes have a little too much hp for how good they are. Would probably reduce by 3-4.
Still, fun game. Easy to pick up and has enough depth to be entertaining. Just needs some balance tweaks and mechanical adjustments in a few places is all. Easily a 4/5, but not quite a 5/5.
Good job.