Azathoth, Lord of All

As long as Azathoth is on the battlefield or command zone, Cosmic spells you cast cost {1} less to cast and cosmic creatures get +1/+1.

Flying, Trample, Indestructible

Whenever Azathoth enters the battlefield, all creatures opponents controls get a madness counter.
Whenever a cosmic creature deals combat damage
to a player, that player sacrifices a permanent.