Scythe of the Mastermind

Equipped creature gets +3/+3 and has Slaying (Whenever it deals damage to a player, that player sacrifices a creature.)
Equip {5}, Indestructible
{w}{b}{g}, Exile equipped creature: You may put a card named Eldorius the Mastermind from any zone onto the battlefield. Attach Scythe of the Mastermind to it. Activate this ability only if each opponent has 20 or less life.