Like most Magic: The Gathering cards, the value of Phyrexian Ingester depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (New Phyrexia)
That said, there is one card in particular that has completely captivated my attention: Well, not exactly Blood Artist, but close: [card]Blood Artist[/card], combined with sacrifice outlets and creatures that leave behind tokens after dying, is the centerpiece of an archetype known as The Aristocrats, regardless of the format (and regardless of if there are any cards with the word aristocrat in the deck)
But it's a bit too, dare I say, kawaii for me
That means you have the greatest potential to find a serious buyer whos ready to pay top dollar for your awesome high-grade slab
Unlike a certain commander who gives opponents card advantage when trying to hurt them, Sheoldred, The Apocalypse only focuses on making drawing cards continuously damaging for them and great for you the added deathtouch makes your enemies think twice about blocking damage, keeping the game plan simple enough that the card will always be in high demand