Cloudsteel Kirin Cloudsteel Kirins mechanic, which prevents anyone from winning, is interesting, but thats not why this equipment creature made my list
Additionally, this creature is a powerful engine that threatens to eventually end the game if not answered
A one mana 1/1 with death touch is always playable, and this has an effect you can use in the extreme late game that is likely to make it massive
Keep in mind that the character you want to banish needs at least five Strength, so use Happy, Good-Natured or Scepter of Arendelle to give strength to the character you want to banish if necessary
Collective Brutality The life drain on Collective Brutality might be the least picked mode, often just tagged onto the Duress or -2/-2 so you can discard a reanimation target, but thats a pretty decent effect