You can obtain the Donphan ex (4-Diamonds rarity) card by opening Wisdom of Sea and Sky: Ho-Oh from Wisdom of Sea and Sky set
Menace for all my critters is really, really good
He's one of the ultimate examples of the type, however, for three reasons
100-card singleton decks will produce awkward hands most of the time, so youll have to be experienced with the deck to see what hands allow you to ramp out your Commander turn one, which hands dont do anything at all, and which hands will give you a good chance to win turn 2 or 3
The outlaw synergies have only been introduced recently, but they have a lot of depth since assassins, mercenaries, rogues, warlocks, and pirates have years of support, not to mention how cracked Treasure tokens are