The Eclipse

Sacrifice all nonland permanents except for one creature, that creature gains the creature type
Demon God, Indestructible, X +1/+1 counters, Annihilator X, where X is the number of creatures sacrificed, then destroy all creatures.

"At this great time of blessing... I bid thee welcome
to this distant setting, this abstract time. Thee,
honorable child consecrated by the laws of causality.
We art kinsmen..."
— Void, to Griffith