Bloodcult Worshiper

When Bloodcult Worshiper enters the battlefield choose another Gramb creature you control.
Sacrifice all other creatures you control except
Bloodcult Worshiper and chosen creature.
It gets +X/+X and haste until end of turn,
where X is the converted mana cost of all
sacrificed cretures.
"Many died because of cults.
Many got strong due to them. Including me."
-Ylthin, Bloodcult Champion