Toss in a Veilborn Ghoul or two and really pump the rats out!! Discarding it using pack rats to make more rats and anytime you play a swamp, the Ghoul comes back into your hand
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Have you looked into Cathedral Sanctifier any? It's a good one drop and you gain 3 life when it is played. Also Gisela, Blade of Goldnight seems like a standard suggestion for red/white decks right now.