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You can also get extra mileage out of your fetch lands like Wooded Foothills thanks to the way Landfall trigger works

Since it's a Quick-Play Spell as well, it can be used during either player's turn to get rid of cards the opponent had just Set

Since a Rat Commander deck has almost exclusively Rats, Coat of Arms will boost all of the Rat creatures to massive stats that are hard to deal with

So, right off the bat, there's a cool way day/night interacts with this commander and your opponents: if you can force it to night consistently, you'll more heavily punish your opponents for playing spells, since they're going to switch it back to day and power up your commander

Rounding things out is Mask of Griselbrand

Right now, we have better cards like Hellrider, but once we have a new format, this seems perfect for the top of a Rakdos curve