Vessel of Endless Rest

Five-color rocks are interchangeable by design: Manalith and its many cousins all do the same any-color-on-tap job for the same three mana, so the question for any new one is what justifies the slot over the rock you already own. The answer here is a second function bolted to the enters-the-battlefield trigger: a one-shot graveyard tuck that buries any card, in any graveyard, on the bottom of its owner's library. That clause does strategic work the mana ability never could. It is asymmetric reach into an opponent's yard, knocking out a reanimation target or a flashback spell or a key recursion piece, and it can be turned inward as insurance, retrieving a card from your own graveyard to the bottom of your library where it can be drawn again rather than left to rot. Most fixing artifacts ask you to trade tempo for color access and offer nothing else; this one collects the same toll and hands back a flexible disruption effect that does not need the dedicated graveyard-hate matchup to ever show up. The mana stays mono-purpose and fair, while the enters trigger is the part that decides whether the artifact earns its keep over a vanilla rock. It is the quiet two-job build that reads as filler on the page and finds a use in more games than its rate suggests.