As for the attack trigger, its probably quite respectable in Draft, but thats just not how Constructed games look likely to play out in the months to come
I dont think it would add to much value to the card given the condition but if you like the look of BGS/CGC or the protection they provide, it could be a consideration
If you choose not to (or can't) cast the card, it remains exiled with no time counters on it, and it's no longer suspended
Impetuous Devils Stay away Ball Lighting creatures don't make it in Modern because you can't pay 3-4 mana for a burn spell that dies to a Bolt
If this card is attached to 1 of your Pokmon, discard it at the end of your opponent's turn
However, it's never too late to send in your old collection to PSA or CGC to see if gem mint copies exist in your collection.