I was playing Thief Rogue in wild and got Objection out of Shadowjewler Hanar. It worked normally on a Ball Hog. Later, Objection was replayed using Contraband Stash. My opponent played Magtheridon, Unreleased and it disappeared. HOWEVER, the end of turn effects continued as if he was still on the board.
Just a hunch but the same probably happens to Archdruid Naralex, Ancient of Yore, Soridormi, and Dozing Dragon.