Here's the scenario:
I was grinding bronze arena. I had a vampire dagger (not flying) and gargoyle with liquid shadow on it and the AI had bone wall with 4 counters left and used anti-matter on my gargoyle. Then when I end my turn and hit with the gargoyle, my opponent healed 7 points from the attack and I got hurt 7 points by my gargoyle. The bone wall only lost 1 counter due to the vampire dagger (so it was down to 3 now) and wasn't affected by my gargoyle. The very next turn though I destroyed his bone wall with my other 2 gargoyles I summoned plus the vampire dagger already out.
I understand the part where (when there's no shield) the opponent would heal and I would take damage when my vamp-gargoyle becomes anti-mattered, but what I don't understand from this is why wasn't the AI's bone wall affected in any way by my vamp-gargoyle after it was anti-mattered?
Not sure what to call it, a glitch or a bug, but something's definitely off here. That bone wall should have lost a counter from the gargoyle. The AI wasn't supposed to heal and I wasn't supposed to take damage. The whole attack was supposed to be blocked.