Have you considered a couple Congregates, either main deck or sideboard? With the token generation you have, each one could be a quick 2 life and get you effects of the Serra and Felidar going even faster.
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I was just playing around with what I had on hand, good suggestions though, hafta try a couple.
You could add in Grinding Stations and mill just like you do with the blasting stations. While you're at it, a Golem Foundry would be making extra 3/3 tokens while you cycle the retrievers through the graveyard.