Currently, most Zenos early brews go down the Voltron route, packing Voltron commander staples like Swiftfoot Boots, Commander's Plate or Blackblade Reforged
Suppose it's just take something, buff something, sacrifice the thing you took, then draw, maybe one of green's "sacrifice a creature, tutor for a creature." Marcy: A somewhat expensive "borrow a creature" with extra benefits, the bigger side of this card is likely to be the ability to hopefully draw yourself a lot of cards at the end
Then, all of those cards go into their graveyard
Unfortunately for Sinkhole, black decks or mono-black decks arent that interested in the effect
Third, Modern Elves player will have a fairly easy time porting over the deck, since some of the cards are the same and the way the decks play is fairly similar, which could increase demand for Gaea's Cradle even more
For example, say you exiled the card Argothian Sprite with Hazel's Brewmaster