Illuminor Szeras
Legendary Artifact Creature — Necron
Secrets of the Soul — 
, Sacrifice another creature: Add an amount of equal to the sacrificed creature's mana value.
"Immortality is not quite the same as invulnerability, but it is close enough."
Darren Tan
Rulings
Use the mana value of the sacrificed creature as it last existed on the battlefield to determine the amount of {B} to add.
(wotc • 2022-10-07)
Rulings
Use the mana value of the sacrificed creature as it last existed on the battlefield to determine the amount of {B} to add.
(wotc • 2022-10-07)