The original five have each had at least 3 versions of themselves printed, but Jace and Chandra are each up to 4 currently.
Now, the cheapest surge foil copy of Sephiroth, Fabled SOLDIER on TCGplayer is $849, and that doesnt even include shipping
order: 500 pieces Changsha Besty Gifts Co., Ltd
This decimates an opponents board while dealing a bunch of damage to them so they cant stabilize afterwards
While one mana is easy enough to pay, when you have 5 copies of Flusterstorm on the stack, it becomes a lot harder for your opponent to manage
Devour For Power had maybe five cards that let you mill yourself, while Sultai Arisen has 14 at various spots on the curve: Hedron CrabHedron Crab Life from the LoamLife from the Loam Will of the SultaiWill of the Sultai There are 51 cards that mention the graveyard in some capacity, including these excellent grindy midgame pieces: Teval's JudgmentTeval's Judgment Diviner of MistDiviner of Mist Conduit of WorldsConduit of Worlds Kishla SkimmerKishla Skimmer Finally, you need your closers: Lord of ExtinctionLord of Extinction Afterlife from the LoamAfterlife from the Loam Colossal Grave-ReaverColossal Grave-Reaver The deck is just good, not-so-clean, fun with its constant churning of the yard for hijinks and value