The only problem here is that its effect triggers at the start of your turn. In an ooze meta this is unplayable and you ARE paying a hefty price up front for the chance to summon free high cost demons from your hand. A 5 mana tempo loss is a pretty big deal outside of control vs control matchups which are quite rare with Jade and Razakus being dominant.
Eh. 5 mana for "do nothing" is always problematic. Factor in that it summons AT THE START of your turn (so you can't attack with it) and it becomes even worse. You also need a couple of targets in your hand AND deck. There are currently not enough demons so this would be consistent enough. Maybe there are more to be revealed. Until then, it's simply not worth it to cheat out a Voildwalker or lose the battlecry of Enforcer, so the only decent targets atm are Kruul, Infernal, Doomguard, Voildlord and Despicable Dreadlord and one of them is mediocre, three aren't played in a control warlock setting, where this would make sense, leaving only one good target for it.
So are we seeing two directions for Warlock? A demonlock or discardlock? I guess this card would be risky to play in a discard deck, and is redundant with Krul the Unshackled. There's value with Doomguards and Voidlord, but for the other demons, you'd want to play their battlecry.