The extra choice of juicy threats to steal from our opponents increases exponentially as we add more players, making Thieves' Auction better and better and more fun than a barrel of monkeys
The enters-the-battlefield ability is also great at helping filter away lands in the late-game to mitigate flood, and can also allow you to cycle away cards that are poor in the matchup in Game 1s, like Thalia, Guardian of Thraben in the mirror match or Reflector Mages against other control decks
Land Color tag templates(None) Island Basic Land - Island Color tag templates(None) Color tag templates(None) Land (CTRL to add secondary) Color tag templates(None) Hoard Robber Whenever this creature deals combat damage to a player, create a Treasure token
Honorary Mention: Rahilda, Wanted Cutthroat / Rahilda, Feral Outlaw This mention is only honorable if you use the command zone on Arena, namely, in Brawl with it's Historic card pool
Assassins with high activation costs tend to lose a lot of utility, but Kiku, Nights Flower deserves mention for being cheap to cast and a potential commander in her own right
What makes Oath less brutal in cube than in constructed is its sloth, its necessary randomness and its potential danger
