Mind Flayer/Kasmina
My opponent cast mind flayer, then I cast kasmina on said opponents mind flayer...the next round I expected to have gotten my creature back, well low and behold I did not! When the card states it lose all abilities it should loose all abilities! Hence myself getting my creature back under my control! Then I actually did not!
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[Deleted User] commented
The Mind Flayer has to leave the battlefield for you to regain control of your creature. The ability the Mind Flayer lost has already done its thing, it fires once, and the effect continues for the stated duration. It doesn't matter that it loses its abilities, that it becomes a vanilla 1/1, or becomes a noncreature, becomes a creature with a different name, or anything similar to that. As long as it remains on the batlefield, the duration of the continuous effect generated by the resolving ETB trigger does not end.
Otoh, the control effect ends IMMEDIATELY when the Mind Flayer does leave the battlefield, no delay whatsoever, it will happen even during the resolution of a spell ort ability.