Was playing my Y'shtola Brawl deck and put him in because he is grea in paper. He works just fine on opponents turns but multiple times I would hit them on my turn and he would target something in my graveyard only for the message to say "you cannot cast this card" no matter what I targeted.

Is my turn
Have Emet-Selch
Hit opponent, triggering Emet-sSelch
Target Price of Fame
Unable to cast it, despite many valid targets and plenty of mana

Is my turn
Later, with one of my own spells on the stack that I want to counter just to trigger Y'shtola
Emet-Selch targets Dream Fracture
Unable to cast it, despite it having a valid target and plenty of mana

I used Price of Fame this way just fine on the opponents turn, only when he triggers on my turn does he not work.

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