Instead of playing it safe, black decks trade life, sacrifice creatures, and treat the graveyard like a second hand
From Theros: Beyond Death comes Dryad of the Ilysian Grove , a powerhouse mana fixer that has Chromatic Lantern's passive ability and allows extra land drops
Even the ability to take out multiple additional card types combined with the ability to take out multiple copies of that card, or multiple copies of the same token, does not come close to compensating for sorcery speed
It can always sacrifice itself as a one-shot proliferate effect too
Arnyn, Deathbloom Botanist Came here to say Arnyn, Deathbloom Botanist turns lots of your creatures and tokens into Serrated Scorpions
Ephemerate is probably strongest in 4c Elementals, where every creature has a threatening ETB that can value-spiral out of control quickly