They, too, will have to answer their own questions about whether you will exert or not, but answering the proactive questions you face is much harder than the reactive ones they handle
Genuine Japanese cards typically have a distinctive texture, specific colour saturation, and particular text clarity
Good price, good service, will be using again
It's oddly limiting that you must tap to get your ramp, but thankfully vigilance helps mitigate this
Fraying Sanity's triggered ability counts the number of cards that were put into the enchanted player's graveyard during the turn, even if Fraying Sanity wasn't on the battlefield at the time those cards were put there, and even if those cards have left that graveyard