Soul Warden, Soul's Attendant, and Auriok Champion all gain you a life when a creature enters, and stack together, so if all of them are on the battlefield, that's three life from just one creature entering
Building Miracles The list I played was not perfect, but I would describe it as the best skeletal structure for this deck
Gorilla Titan Gorilla Titan has the possibility of being an 8/8 creature with trample for only five mana
Ardenn, Intrepid Archaeologist also says you can eliminate the best blocker with Pacifism, and you can save sweet auras like Staggering Insight that are attached to a creature you need to sacrifice
Also note that cards totally mess around with all these fundamentals in wild and interesting ways, and that is the magic of Magic
If you load up your deck with other creatures with damage-dealing abilities, this could be useful, but its definitely niche