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Abyssal Harvester is worth noting as another demon to pair with Unholy Annex, but I think not having decent stats or a powerful enter the battlefield ability make it just not good enough

Flash, much like Channel, presents such a simple win condition utilizing two cards that it deserves a spot on this list, but isnt higher due to its lack of flexibility

4 bodies for the price of 1 is even nicer when you can sacrifice the tokens to get some of the mana back

It started as a "demonic" tutor on Theros (you can see above that we restricted the tutor and then moved it into white to allow us to get Ephara on the back face)

Necrogoyf Necrogoyf gets its own spot because it has even more graveyard synergy than the other goyfs

Its just that the thing they do can be a little underwhelming (Malakir Blood-Priest, Mages Attendant), or hard to fully control (High Priest of Penance), or are just pure removal magnets who will almost never get to really do their thing (Magus of the Balance, Pontiff of Blight)