Mulligan:
Aggro: Possessed Villager, Flame Imp, Mortal Coil and Prince Keleseth
Prince Keleseth is ok to keep even though you mostly would want the 1 drops, as you usually will either have a 1 drop in hand or draw it from your other 2-3 mulligans + top deck. If you get this on the coin, its usually smart to coin it out, for your next topdeck to have the effect.
Control: Possessed Villager, Flame Imp, Mortal Coil and Prince Keleseth
Same as aggro, you could potentially keep Barnes too, as Barnes is very strong in this deck.
Deck description:
This deck tries to build around three cards that look pretty weak to begin with: Prince Keleseth, Meat Wagon and Blood-Queen Lana'thel. I do not think this will be a Tier 1 deck, but this is the best i could do as a viable decklist including the mentioned cards. Plays like classic zoo, with the addition of the mentioned cards and: Despicable Dreadlordm Arfus and Barnes