Altar of Dementia
Artifact
Sacrifice a creature: Target player mills cards equal to the sacrificed creature's power.
"My dreams have brought more visions from our master: an altar, exquisite and perfect. We must build it at once." —Writings of Artonac, priest of Gix
Isis
Rulings
The number of cards the target player puts into their graveyard is equal to the power of the sacrificed creature as it last existed on the battlefield.
(wotc • 2019-06-14)
If the target player's library contains fewer cards than the sacrificed creature's power, all of those cards are put into that player's graveyard. That player won't lose the game until they try to draw from the empty library.
(wotc • 2019-06-14)
Rulings
The number of cards the target player puts into their graveyard is equal to the power of the sacrificed creature as it last existed on the battlefield.
(wotc • 2019-06-14)
If the target player's library contains fewer cards than the sacrificed creature's power, all of those cards are put into that player's graveyard. That player won't lose the game until they try to draw from the empty library.
(wotc • 2019-06-14)