Bring in lifegain creatures like Obstinate Baloth to stabilize, or sweepers like Anger of the Gods
For instance, we can play the aggressive gameplan and use them to accelerate the game by getting baddies to come out and play, or we can use effects that tax and slow down the game (or do the polar opposite), and there are even some super nasty creatures that we could build the entire deck around, working hard to get them onto the field under an opponent's control, such that the deck would almost function like a combo deck to ruin our opponents
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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