Auctioneer's Discretion: The auctioneer has the right at his or her absolute and sole discretion to refuse any bid, to advance the bidding in such a manner as he or she may decide to withdraw any lot, and in the case of error or dispute, and whether during or after the sale, to determine the successful bidder, to continue the bidding, to cancel the sale or to reoffer and resell the item in dispute
Chaos Orb How is a card that is banned in every format it's legal in, and unreliable like this, worth more than $500 played for it's cheap Unlimited version
In my experience, another thing that makes this one of the best commanders for combo decks is having access to all five colors, which gives you an incredible array of tools
At best its an extremely situational combat trick in the color that wants combat tricks the least, which doesnt sound very appealing