Ossification targeting does not trigger abilities
I had three venerated rotpriest on the battlefield and when my opponent targeted one of them with ossification, their abilities did not trigger. Their ability specifically states when they are the target of a spell, yet this doesn't happen with ossification for some reason.
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alurenswarm326#36585 commented
Unfortunately, the only thing that Ossification as a spell targets is the basic land it is going to enchant. Cards like Ossification, Touch the Spirit Realm, Borrowed Time, etc. have a powerful triggered ability, that you can observe with a line of text that starts something like “When Ossification enters the battlefield, [do XYZ].” This triggered ability doesn’t cause Rotpriest to trigger as a part of the game rules. Unfortunately considering that they are from the same set, I think this was intended, but it is either way not a bug in Arena’s client; that’s how the game works,