Like most Magic: The Gathering cards, the value of Xanathar, Guild Kingpin 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 (Adventures in the Forgotten Realms)
This is due to a combination of the card playing at sorcery speed and so asking that you tap out, and also due to the fact it gives you more raw resources than Dig but no real selection on what those resources are
Sorcery Color tag templates(None) Eldritch Pact Target player draws X cards and loses X life, where X is the number of cards in their graveyard
Right out of the gates we get the most expensive card in all of Magic's history, Draco
Artifact Color tag templates(None) Cryptolith Fragment This artifact enters tapped
When you add in land-searching options like Town Greeter and the landcyclers, as well as four-mana ramp spells like Reach the Horizon, getting the mana together to cast Omega, Diamond Weapon or Coliseum Behemoth is a question of when, not if
