Magic has recently grown to a wider than-ever audience with differing card needs
The incredible Lifeblood Hydra is nice and cheap now thanks to the Commander Masters reprint, Voracious Hydra is a flexible card that should see more play anyway, and I could list well over a dozen other Hydras that basically just read: sink mana, get stupid large
It works particularly well in this archetype because leave the graveyard cards are often triggered by other things that generate an advantage: You might return creatures to your hand with a Regrowth, reanimate a creature, play lands from your graveyard, etc
You see, for X mana and one Black or Phyrexian mana, you can remove up to X counters from a permanent, and then Hex Parasite get +1/+0 for every counter removed
Reprints of Many Popular Cards from Past Packs!Features reprints of popular cards and event-exclusive promotional cards, such as Sabo from OP04 and Trafalgar Law from ST17
its Phyrexian Delver with fewer drawbacks and more keywords