Dark Petition was full mana and I chose NotNow. The card played anyway.
Those kind of cards that give mana aside from their main efect often behave like this. If conditions are met they will cast and grant you the mana, but the “not now” will affect the main effect anyway.
If I choose ’ Not Now ’ The card should not be put into play.
otherwise, just stop asking me if I wany to play it or not.
All spells with secondary effects work like this. Your “not now” cancels the main effect, but the secondary still triggers. Its definitely not right, though.
For now just suppress all spells you don’t want cast that turn, no matter how far down your hand they are.