Caulron Familar not exiling
I was playing against a Rakdos sacrifice deck which had both a Cauldron Familiar and Witches Oven on the battlefield, enabling my opponent to us the cat combo to drain my health and have a blocker each turn.
In order to stop this, I allowed my opponent to sacrifice the Cauldron Familiar and then return it to the battlefield while it was still my turn (the endstep) - I had an Etching of Kumano on the battlefield, which states. 'If a creature dealt damage by a source you control this turn would die, exile it instead'. After the Familiar returned to the battlefield, I targeted it with a Play with Fire, killing it. My opponent's Witches Oven was tapped and they had no other way to sacrifice the cat. But the Cauldron Familiar did not go into exile after being dealt damage by my Play with Fire, but instead returned to my opponent's graveyard despite the Etching of Kumano flipping that turn and damage being dealt to the CF by a source I controlled (the Play with Fire) all in the same turn.
This enabled them to continue the cat combo once they were able to generate another food, allowing them to gain life and was the prime factor for me losing the game when my opponent only had two life left - life they only had due to the Cauldron Familiar's ETB effect.
Should the Cauldron Familiar not have been exiled when it was dealt damage by a source I controlled on the turn Etching of Kumano entered the battlefield?
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Rezzahan#77802 commented
Did you also control a Soul-Scar Mage at the time? If so, the replacement effect of that one makes damage into -1/-1 counters, so no damage is dealt.