Hearthpwn

It's like Soulciologist Malicia but much worse since the number of minions depends on the enemy board and you can't focus Imps on single target. Won't see play unless there's more synergy with this card.

Ghetto Soul Mirror?

Except a wears version of it.

Amusingly, despite working completely differently, this card serves a similar purpose to Grim Patron in ye olden days – a mid-to-late-game board clear that punishes having minions small enough to get eaten by a 3/3.

6mana for a 3/3??

Nonononono. Admittedly, the card is a bit ambiguous, but I read it as "For each enemy minion, summon a 3/3 imp which attacks it." So you'd get 3/3 imps equal to the number of enemy minions.

6 mana for an enemy-only 3 damage AoE that potentially leaves imps on the board?

Not... terrible. Mostly the Fel tag is what makes this attractive to me. Play this alongside the 3/7, copy this, it gives Fel-only decks some more AoE. I feel like Felfire in the Hole is just better?

enough with the wide warlock removal

Mass Poison for Warlock when?