Then there are cards like Extinction that hit all your changelings no matter which subtype you pick
The Goose Mother My nightmares incarnate
And while he may only enable you to sacrifice one permanent per turn, team him with sacrifice engines like Viscera Seer, tokens or recurring permanents (like Bloodghast or the cat oven combo of Witchs Oven and Cauldron Familiar) to sacrifice, and drainers like Blood Artist and Mayhem Devil, and things snowball very fast
Not because of raw powerthough it does have plentybut because every card you play needs to generate that all important value to validate itself
Despite being a bit clunky, its a solid deck that shows us just how powerful Location cards are when used with the right strategy
Grim Discovery can return a creature and a land from the graveyard to the hand, Blood for Bones lets us sacrifice a creature to return a creature to the field and another to the hand