It can be recurred from the graveyard, it costs a tiny bit less and exile 20 from the library is far more game ending than annihilate four
For card advantage, things like Fact or Fiction and similar cards let you present interesting choices to other players to stay on the Dungeon Master theme while still gaining advantage
A card with a high grade can be worth significantly more on the open market than its ungraded counterpart, with many collectors using a card's PSA 10 (Gem Mint) value as a benchmark for the maximum potential value of a card
The design is fun, recognizable, and rewarding to complete
All of this explains why, despite March of the Machine arguably having the most differing showcase styles in a single set, it manages to pull it off so well
Though completely useless in an actual deck for the trading card game, The One Ring is worth a significant amount to Magic: The Gathering collectors considering that Wizards of the Coast the studio responsible for releasing the card game printed a single copy to thematically reflect the significance of The One Ring within JRR Tolkiens trilogy of books