Ripping your opponent's hand apart by forcing them to discard two cards feels great, but Junjis second ability to return a creature from any graveyard to the battlefield under your control is much more appealing
That also lets you leverage instant-speed discard effects very well
Psychic Frog, Key to the City, Harnfel, Horn of Bounty, Ultimate Green Goblin, and Chainer, Nightmare Adept round out the ways to discard, but there are certainly more every set
Emerald lacks in removal, and now you dont have to keep type-specific removal cards in your deck that are useless in some matchups
Combined with The One Ring's undeniable potential in the Commander format, and this may at least explain, if not justify, the $100 price tag on TCGplayer.com for The One Ring's promo version
Let's say you have a Spell Pierce in your hand