Judith / Overlord of Balemurk Bug
I have Judith, carnage connoisseur in play. My opponent has overlord of balemurk in play. I hit the overlord repeatedly with burn spells. On cast, I chose to give the spells deathtouch. Not only did the spells not destroy the overlord, but the damage dealt to it did not clear after the turns were over. One of my spells dealt 1 damage to each of my opponents creatures, destroying them all, except for the balemurk. I dont know how to upload Arena log files. I dont have any screen shots.
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Muggle_of_the_Coast#19144
commented
Did you by chance also have a Soul-Scar Mage (or some other effect that gives your spells wither) in play?
Soul-Scar's ability replaces damage by -1/-1 counters. This negates deathtouch (the creature isn't damaged, so there's no deathtouch damage to kill the creature), and would also explain the damage seeming to stay around after the turn is over.