Relentless rats

This is an amazing card you can have any number of this card in your deck and for every other on the field they all get +1/+1 so already now you are probably thinking of all the possible combos you can do with this card i am actually making a deck around this card right now if you want to see it heres a link
http://www.mtgdeckbuilder.net/Decks/ViewDeck/269621