You might think of adding in a couple of swarmyard lands to help regenerate those rats.
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Looks like it would be a pretty annoying deck to play against, IF you last long enough to get out your stuff. My one criticism is that the average converted mana cost is 3 and your cheaper stuff primarily targets creatures. In tourneys you'll likely run into some serious problems with ultra-fast burns or affinities that overwhelm you by turn 2 or 3. You won't have much time to build up. Maybe try to lower the costs a little. 7.5 out of 10 from me.