Hi, I just used Mist in a recent war attack to counter a costumed rigard, but twice when Mist’s special was active on Rigard, he fired his special only for both the HoT and attack buff to appear on him.
Defence team only had Khagan (left wing) and Costumed Rigard (right wing) alive when this happened, so there were no blinds, cleanses or anything else in play and Mist’s debuffs were definitely showing on Rigard when he cast his special both times.
Having read the order of Costumed Rigard’s card, he cleanses after he applies the HoT and attack buff, so Mist should have blocked these from appearing on him, but not Khagan. As it was, both times, both defensive heroes received Rigard’s buffs.
Unfortunately I don’t have any screenshots as I was too focused on winning the fight, but having tried to recreate the issue in a raid just now, Mist successfully blocked Rigard’s buffs when he cast his special, so this appears to just be an issue in Alliance Wars.