An Imp minion for a pure Warlock who knows that Health is a resource. Can be comboed with cards like Diseased Vulture,Darkglare and Flesh Giant.

I compared design of this card to Lightforged Zealot:

Lightforged Zealot is a 4/2 (about 2.5 Mana worth of pure stats) and equips a 4-Cost weapon. The card costs 4 Mana, so you get the value of 2.5 Mana for having a "Pure" deck.

[Hearthstone Card (Dark Iron Blacksmith) Not Found] is a 2/5 with Taunt (this is worth exactly 3 Mana) and gives you 8 Armor (Steel Beetle gives you 5 Armor, but the requirement is easier to fulfil and [Hearthstone Card (Dark Iron Blacksmith) Not Found] is for a primary Armor class so the amount is bigger.). With today's power level we can assume that 8 Armor can be worth 2.5 Mana.

Pit Gatekeeper doesn't like it if you're not devoted enough as a warlock! He does damage to your hero if your deck isn't full of warlock cards.  It's different from other no netural cards in which the benefit is removing a drawback rather than adding an additional effect.

Shandris Feathermoon allows the Hunter to upgrade their Hero Power to give them the ability to hit minions at any time giving Hunters a better control ability. She is a very notably skilled archer, and her skill in archery will be given to you when you play it. So long as you build your deck to have no Neutral cards anyway.