Also, I should note that the card's ability only works if you legally got it into your hand
The ultimate is quite easy to pull off with Sorin growing so effectively and protecting himself well and gives black a lot of ways to deal with things it otherwise struggles with by using your opponents cards to get the job done for you perhaps with a Disenchant they handily had for you
D&D and Magic go together like peanut butter and chocolate
It's a small value engine, but it is definitely not among the most powerful artifacts in the game like Black Lotus, the five Moxes or Time Vault
You get some form of card advantage no matter what you roll, but a natural 20 (or a 20 heavily influenced by Barbarian Class and friends) lets you reanimate a creature and put an expiration date on its owner
Ive played against it a couple of times in Brawl on MTG Arena, and if you cant deal with Narset before it attacks, it's pretty much game over due to its ability that lets it target non-creature spells from any graveyard, exile them, and cast a copy for free