As youd imagine, this compounds very swiftly, so whoever ends playing Yshtola is consistently draining the life out of other players, and gaining life in return
Another way for mill to pay off is to pair it with reanimation
Try to use Terra and other cards like Gogo: Mysterious Mine, which can become a copy of Terra to quickly get his cost down by adding creatures to the graveyard
While the amount of play that Kytheon, Hero of Akros will see depends on the development of an aggressive white deck, I would be surprised if this sort of deck didn't show up at some point in the next year and a half
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Yavimaya Elder (Ext, S, Block) A mainstay of The Rock (a black-green deck that thrives off of card-advantage creatures), the Elder potentially nets you a four for one advantage: it can block and kill a creature, then sacrifice to draw a card plus two lands