If your deck has 5+ ways to remove cards from your graveyard -- like Flashback or other effects -- this is a good value engine
Lets take a look at all the ways you can lose a game and the avenues they provide to turn this in your favor
Lightning Greaves is massively popular too, but shroud makes it much less flexible
You may play that card for as long as you control Lightning
Notable Cards Its unclear if anyone has pulled The One Ring from the Lord of the Rings: Tales of Middle-earth rare/mythic flex slot in any of the first round of Lord of the Rings Jumpstart packs, but thats theoretically possible
Otherworldly Gaze If you count Surveil spells as self-mill (and I do, given how rarely you see triggers that care exactly how cards end up getting from your library to the graveyard), then Otherworldly Gaze is as good a choice as any for the most consistent, efficient, no-bells-and-whistles version of the effect