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Your deck concept is good but you need more mana to support it. Too many four casting cost cards in the deck. Also you need some sort of elimination for your opponents creatures that make it on the field. Without Cradle of Vitality - great card - you will not have any size on the field and may get worn down by your opponent. Decks that have life gain should use the extra life as a resource to kill creatures, draw cards etc. Your sideboard should address enchantment and artifact removal. Gnat Miser 90% of the time will have no effect on the match and acts as a vanilla creature which should be replaced.
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What about turning this deck into two decks? Like a Rat deck and a Cat deck that are meant to be played against each other.