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The mana value is what holds it back, which will be the case for all of these, but at least one of these Gearhulks feels like it should be breakable

Card Illustrator: The First Chapter

You'd probably lost complete control of the game and 15 life wouldn't have done you much good anyway so you don't want to focus on healing specifically, you want it to be a byproduct of spells that are already great without the healing

Ratigan's Party, Seedy Back Room As mentioned, having damaged characters is a subtheme of this deck

Bring in lifegain creatures like Obstinate Baloth to stabilize, or sweepers like Anger of the Gods

First, when a human card deals damage to you it gets destroyed, which is already a worthwhile defense