Your opponent's monsters can attack directly if this is the only monster you control
This can avoid a lot of headache and potential grievances on the table, and you really want to maintain friendships over the fleeting satisfaction of winning
The main form of interaction you have are the artifact and enchantment hate as well as the board wipes, of which youll use sparingly since you kind of want your opponents to have a board presence
It can be cut off at the knees with early Commander removal, but if you can get into a position where youve got some colossal hydras bearing down on an opponent or two, youll be glad you did your math homework
Once he hits the battlefield, you dont lose unspent mana anymore, and all unused mana becomes red
For example, it can make your Final Countdown go a little bit quicker, or it can make your opponent's Swords of Revealing Light a little bit weaker (you can definitely tell what era of the game I'm from with these examples, hehe)