The One Ring Mount Doom Scene card is not the Serialized 1 of 1 Ring (though they are mechanically identical). Serialized Ring cards—including Serialized Elven, Dwarven, or Human alt-art Sol Ring cards—can only be found in some The Lord of the Rings: Tales of Middle-earth Collector Boosters. Only one card has been printed of The One Ring (Serialized 001 of 001), and this card can only be found in one English-Language Collector Booster. Non-serialized Ring cards are mechanically identical to their Serialized versions.
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 history—found in 25% of packs), with a combination of 1–4 card(s) of rarity Rare or higher and 3–7 Uncommon, 3–7 Common, and 1 Land cards. A Traditional Foil Land replaces the basic land in 20% of Set Boosters and a Foil-Stamped Signature Art Card replaces the Art Card in 10% of Set Boosters. A Traditional Foil Borderless Mythic Rare card can be found in <1% of boosters.