Zakera, Augur of Calamity

{r}{w}{b}, {t}, Discard a card: Zakera, Augur of Calamity deals 2 damage to each opponent. Each opponent sacrifices a creature with the greatest power among creatures they control.
Substantiate —Whenever Zakera, Augur of Calamity becomes tapped, if it's not attacking, each opponent discards a card and loses 2 life.
"Kroen was only the impetus. We are all the cause of this devastation."