Galeck's altar

Partner, defender.
{b/g}{g/u}{1} - Sacrifice a creature, gain life equal to half of its toughness rounded down. Use this ability only any time you could cast a sorcery.
Pay 5 life and sacrifice 5 creatures, put a legendary 8/8 black demon token named demon lord into play. Then sacrifice Galeck's altar. Use this ability only if you control ''Galeck, the Revenant''