Use the mana value of the sacrificed creature as it last existed on the battlefield to determine the value of X
The card is essentially a souped up Imoti, Celebrant of Bounty for Colorless, providing a ton of card advantage and mana advantage from the command zone
(To mill two cards, a player puts the top two cards of their library into their graveyard.) The card you put on top of your library, if any, may be one you just milled, or it can be one that was already in your graveyard
Magic: The Gathering is undergoing big changes right now thanks to the release of the Duskmourn: House of Horrors set after the highly successful Bloomburrow, and the Commander Rules Committee recently shook things up even more with a blog post discussing four big bans coming to MTG 's Commander format
Pokemon V act as the stepping stone to both of those bigger forms, so they're kind of irreplaceable in the current state of the game
PSA 10 and BGS 9.5 grades can push a card far above raw value