it looks ok but a 5 color deck is never really great because you never get the right mana. if you did get the right mana you might not get the cards you want because theres only 1 of each. i would take out some crappy ones and put in some better ones.
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seems like a pretty good deck but u need to add a few more cards. id recommend adding some black and putting in kill spells.
It seems like a bad deck because its too mixed. its 1/3 rat, 1/3 discard/megrim, and 1/3 kill creatures. Theres not many rats, and the marrow-gnawers would probably be hard to get out. the kill spells and discards might not even buy you enough time to get out the good rats. I would put in some stronger creatures and take out a few discards.