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Starving Revenant needs a steep 8 permanents descended into in your graveyard and does a consistent life drain, but they both fall below Sheoldred, the Apocalypse
If a card says counter a spell, draw a card, bounce a thing, steal a thing, do some damage or is some kind of tempo board play and it is in a cube the chance are that the card will be OK
Notably, none of these cards will be banned in any other Arena format, including Brawl and Timeless, and none of them are actually in the main Edge of Eternities set
Only time will tell just how much a deck using these cards is used in the competitive Pokmon Trading Card Game scene, but it will certainly be interesting to see how the meta changes once they're finally released.
In case you haven't seen them before, here's a quick look at some of their peculiarities