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Just had my latest Arena run stolen from me by a tremendously annoying glitch where you cannot cast Stolen by the Fae underneath Fires of Invention. I suspect it is because the game is looking for a legal target but does not see one, but regardless, this is entirely unacceptable. I'm also planning to submit a complaint to Wizards, but this is worth letting people know about since Fires is becoming an increasingly used card and it's quite possible this interaction occurs in other people's games. As you can see, I am not able to cast Stolen in the below screenshot despite having the requisite mana.
https://i.redd.it/he4wf85lvnp31.png
EDIT 1: This also does not work if you tap the mana first prior to trying to cast Stolen. Tested it against Sparky here:
https://i.redd.it/h8nng5h9znp31.png