Like most Pokmon cards, the value of Rhyperior 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 (Diamond & Pearl)
It works very well with Thassa's Oracle and Tainted Pact since your whole library ends up in your graveyard
Inquisitor Greyfax isnt very flashy, but all of her abilities feel very relevant to this decks strategy
Let us start with the basic stuff
If that player doesnt, you mill X cards, where X is the number of influence counters on Palantr of Orthanc, and that player loses life equal to the total mana value of those cards
When working with foils this is the only way to go though (or you can use nail polish)