Abzan has been a popular color combination throughout Magic: The Gathering's history thanks to its vast array of removal spells and beefy green creatures.

Source: https://www.cbr.com/mtg-march-of-the-machine-thalia-gitrog-monster-commander/

Magic: The Gathering's one-of-a-kind card comes as the most recent in a series of high-profile cards surfacing this year.

Source: https://gamerant.com/magic-the-gathering-one-ring-card-found/

This is an unusual choice by Wizards of the Coast, as the cards are obviously not based on 's universe, and this clear departure from Magic: The Gathering's own lore will likely change how the game feels to play in Modern going forward.

Source: https://www.cbr.com/magic-the-gathering-lotr-set-modern-legal/