Have you thought about including Ogre Slumlord? Seems like a perfect fit to me. Deathtouch makes even the smallest rat fearsome and basically every one of your rats spawns a little cousin when it dies.
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I am actually not that happy with the Howling Mines because they help your opponent get lands but I haven't found an adequate replacement yet. If you have any suggestions, feel free to comment :)
Thanks for the comment, never thought of these options.I'll probably include the auras for testing the deck vs friends. If the combos prove too strong/game destroying I'll remove them.