If the biggest drawbacks you cite are that it doesn't hit all cards in a graveyard and the second activated ability costs too much, I'll take those drawbacks when I have the chance to recur the artifact with a Myr Retriever
If you find a Zone Eater in your deck, might as well just throw it out and never look for another one
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On the flip side, it can have a limited effect if it is removing three mana creatures when everything on the board is at a lower mana cost
Similarly, if players crafted an SR or UR Card, they will also unlock the Key that leads to its secret pack
Miscellaneous Dockside Extortionist Hullbreacher Karakas Leovold, Emissary of Trest Nadu, Winged Wisdom Prophet of Kruphix Sylvan Primordial Trade Secrets As much as Ive tried fitting cards into different sections, some didnt really fit in one of the other categories