Ossification did not remove creatures
I was playing a ranked match when my opponent played The Cruelty of Gix and chose to discard Elesh Norn, which he then pulled from my graveyard and put on the battlefield. He had Painful Quandary in play as well. I played Ossification hoping to get his copy of Elesh Norn off the board, as the spell resolved I was given no chance to target his creatures (which at that point was only the stolen copy of Elesh Norn). He then brought in Misery’s Shadow. I tried again with a second Ossification expecting to at least be able to target the Shadow, but again got nothing.
What am I missing, or is this a bug/cheat?!
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[Deleted User] commented
The Mother of Machines under your opponent's control prevents permanents entering under your control from triggering ETBs, including Ossification.