Fairgrounds Warden exile did not trigger
I was playing historic brawl and played fairgrounds warden and it did not give me the option to exile a target creature. Player had 2 creatures on the field, none hexproof, no permanents were preventing enter effects, and he did not counter, as the card still entered the field, just without the option to exile. If it is something to note, he did take control of my commander permanently. The creatures on the field on his side were Elesh Norn, Mother of machines (my commander) and Orinthopter. Additionally, although he had permanent control of my commander, when moused over, it still said that I was the controller, which also might have triggered the bug?
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[Deleted User] commented
Elesh Norn prevents triggers from opponents creatures entering the battlefield. If it was under your opponents control, this ability would affect your permanents.