If an Adventure spell leaves the stack in any way other than resolving (most likely by being countered or by failing to resolve because its targets have all become illegal), that card won't be exiled and the spell's controller won't be able to cast it as a permanent later
(The One Ring Mount Doom Scene card is not the Serialized 1 of 1 Ring, though they are mechanically identical.) Each Set Booster contains 12 Magic cards, 1 Art Card, and 1 token/ad card, Helper card, or card from The List (a special card from Magic's historyfound in 25% of packs)
In Commander, however, things can get even better
Its hard to stand out in a sea of never-ending Commander precons, and I dont think theres anything exceptional going on here, but these decks have enough enticing reprints and flashy new cards to stand on their own
Whenever this creature is dealt damage, target opponent loses that much life