If your opponent has more cards in their hand and field than you do, you can detach an XYZ material from this card to destroy every card on the field except this one
Illustrated by James Paick Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
That said, The One Ring is held back by a few factors, like its relatively high mana cost, so it's not always a straightforward addition to fast-paced Standard, Modern or Legacy decks where every bit of mana counts
The effect of is to revive a water/sea dragon/fish mob by costing this card and 1 Xyz material in the graveyard
While the Premium Missions and its associated rewards are also a nice bonus, they can completed very quickly (especially for new accounts) and offers little in terms of content
However, NM copies are rare and will command over $200 easily when they pop up, so prepare to spend a bit more than the market price for a perfect card