Perhaps they make an aggressive dork, perhaps it is a Goblin Guide, if they sit back you are laughing, if they attack you are laughing
I want to play Zombies in this format, and this removes planeswalkers.
It's also able to manipulate where other creatures exit, an ability it can employ to help other cellarspawn track down their prey or trap a survivor in an endless loop of rooms with no escape
Token-heavy decks or decks with creatures like Shambling Ghast and Primal Druid that reward you for sacrificing them get lots of mileage from a 2-mana 6/6
As an example, thanks to The One Ring and the other serialized cards, we know exactly how many Collector Booster packs they printed of both the Holiday Edition and the summer edition
The main downside comes from the floor: Loot does nothing without a bunch of other permanents in play and gets a nice, fat target painted on its head whenever you cast it