Do we have anything that really works with lifegain? I feel like we should have something (particularly in white) that plays off of lifegain. Everyone loves casual lifegain decks!

Life-gain is indeed always fun. Let's try to think of some Tesla-style life-gain cards, perhaps?

It's notable that Wizards have been doing quite a bit more "when you gain life" triggers recently (and similar things like Path of Bravery or Ayli, Eternal Pilgrim). Zendikar vampires do it quite a lot, and casual products like Commander like it too: Karlov of the Ghost Council and Oloro, Ageless Ascetic.