Then again, this would also be subject to different interpretations of Un-sets, as stated in the beginning, so your mileage may vary.
In modern Magic and especially in the current Standard cycle, there are plenty of commons that might be even more suited for your deck than the most expensive mythic rares out there
Join Terra, Locke, Celes, and the rest of the resistance in their fight against the Empire
This deck works more on a Rat theme rather than a straight poison one since Karumonix gives your other Rat creatures toxic 1
Without that ability Stifle is going to be an extremely narrow card in Historic, and with Thassa's Oracle being banned on Wednesday it has even less to do
Swords, hammers, or even Colossus Hammer turn Cloud into a fast, value-driven threat