You need a non-toy creature to get the first half rolling, after which you can stockpile creatures and fire off the 6-mana room when you're ready
Team Rocket turned Charizard rogue
The Moment's last ability will destroy itself before you can sacrifice it if there are two or more time counters on it as its last ability resolves
Warrior lady, which can remove a large monster or prevent a monster whose effect activates from the graveyard from going off, Mystic Swordsman LV2, who deals with facedown monsters, Blade Knight and Zombyra the Dark, who have some of the highest attack values on a normal-summon monster, Exiled Force, a clean answer to nearly any monster, and many more
Let me give you a classic example of a few: Take Organ Harvest The name is suitably fine, and the mechanic of letting folks sacrifice creatures for two Black mana a pop in right in line with cards such as Culling the Weak