From a flavor standpoint, it perfectly captures the classic cat versus rat conflict
For instance, sacrificing a swamp to play Dark Ritual will only allow you to play one spell or ability requiring at least Three Trips through the Library As in normal Magic , you draw cards from your library
Ur-Dragon has a rebate, which means that this would be able to return a dragon that cost you just 2 mana to play, unless you use backup on itself

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2 Karumonix, The Rat King Toxic Rats While Karumonix, the Rat King, is a solid commander in its own right, it's much better used in the 99 since other commanders can make Rats quickly that Karumonix can back up
The other two are fantastic as well