Formitiis, Demon King

Menace, Shroud, Swampwalk
Whenever a legendary creature dies, exile it and put
a +1/+1 counter on Formitiis, Demon King.
When Formitiis, Demon King enters the battlefield, sacrifice another legendary creature you
control.
{2}{b}{r}: All players lose life equal to the number of counters on Formitiis, Demon King.

“Now, humans... Lament your fate. Weep for the dead. Despair for the living. Wail and tremble in grief. Grovel in awe and fear. I am returned” — Formitiis