This one-mana cleric is a combo-piece waiting to happen, who can tap to add or remove and then distribute a +1/+1 counter
Amber/Emerald Aggro: the lore-rush deck that led pre-Set-13 Standard
Whispering Madness Windfall, but harder to cast
Any deck that floods the board with creatures can cash in this green sorcery for a couple cards, but gaining 8 life while you do it adds a lot of value here
While I could imagine a lot of black decks that end up putting Essence Extraction in their sideboard instead of their maindeck, its particularly good in a Torrential Gearhulk deck, since it gives us a lifegain card we can Flashback to help put a game out of reach of our opponents
They have the same mana cost, they are both instants, and they both shuffle permanents into libraries and then give your opponent the ability to replace that permanent