Cards like Soul Warden and Soul's Attendant provide a steady stream of life, but you can have some impressive turns with something like Children of Korlis to pay all your life twice
The next set to be released is a brand new series called Mega Evolution
Beta (corner radius), spot CE/IE (pointed corners + gold back text), and recognize FBB (non-English)
Thats free ramp and mana fixing for you
It is just a sorcery, so you cant do it in response to anything, but it is uncounterable, meaning youre almost always going to be drawing cards and getting free creatures
Aristocrat decks care about generating lots of tokens, like creatures and artifacts, and then sacrificing them for multiple effects