Cards on the Vintage restricted list can still be played, but players may only include one copy of these cards in their main deck and sideboard combined
This deck crumbles to a stiff breeze, but it seems like Modern finally has its Belcher-esque pure combo deck, and if the right configuration is found, Turn 1 kills might become a scarily regular occurrence
Combine this with the fact that we know more Lord of the Rings will be printed this fall, I'd lean towards digging any copies you happen to have from your bulk and trying to move them while they are expensive
If, for any target, you can't choose a new legal target, then it remains unchanged (even if the current target is illegal)
You can look forward to Borderless, Frame Break, and Borderless Profile cards in this booster box, although the new cards are exclusive to the pre-built Commander Decks