Not sure why you want to draw so many cards as a warlock. Seems too situational, especially when control oriented warlocks tend to have pretty full hands from tapping often. Would risk overdrawing or fatiguing too fast.
I think this card could work. Sometimes when playing Handlock you have to play a lot of minions to combat aggro or early game decks and cannot Life Tap later in the game due to your life starting to dwindle. Perhaps this could fix that?