I have been running Uw Merfolk for a while and before I was running 4 STPs in the main and 4 PtE + 4 REB in the SB against Zoo. Kinda overkill sometimes and not too effective. In order to beat Zoo, the key card is Kira. If Kira lands, it's usually going to be a lot smoother from then on. Right now, I have 4 STPs + 2 Kiras in the main, 3 PtE + 3 REB + 1 Kira in the side.
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Sejiri Merfolk
I was planning on trying him out as a 3 of in the main to try and increase my threat density but not too sure what to cut. At this rate, I might cut Standstills and put in the Sejiri instead. It's going to look more like the 16 Lord build, but instead of Sovereign, I'll have Sejiris and STPs.