Escher, the Broken

When Escher, the Broken enters the battlefield, each opponent loses X life, where X is your devotion to black. You gain life equal to the life lost this way. (Each {b} in the mana costs of permanents you control counts toward your devotion to black.)
I will purge the walls of the prison that holds me. I will feast on the flesh of the living until, just as my prison, they are purged as well. - Escher