Cards on this list include things like Ancestral Recall, the Moxes (Mox Jet, Mox Sapphire, Mox Ruby, Mox Emerald, and Mox Pearl), Time Walk, and the famous Black Lotus
Singleton format means you can't build super consistent strategies
Breeches, the Blastmaker Breeches, the Blastmaker has the same issue as Krark, the Thumbless: The legendary pirate goblin ultimately works better as a spellslinging commander than a coin flip one
However, it appears that recent sales have been more around the $50 range, so that average value could drop
Combining Mogis with a card like Blood Artist would allow for a player to ensure their opponent loses life every turn, and they consistently gain life making the game an uphill battle for their opponent from the moment Mogis hits the battlefield