It's just, as Steve said, different people want different things, and the nice thing about trading card games is we can make cards for different people because there are so many cards
Does your own demand for a card create the value, or is that value better determined by some other metric
He spills Phyrexian ichor as he goes down
Halo foils Even though these are twice as rare as dragonscale lands, they are all trending downwards
Either way, when it comes into play you get to draw two cards, at the cost of discarding one card from your hand afterward
To help populate your graveyard (preferably with four or more card types), the deck has a number of strong mill cards like Nyx Weaver, Stitcher's Supplier, Cemetery Tampering, and of course, the deck's face Commander itself