How do you not see synergy in that deck? It has 3 ways to buff Schirru. It has 3 ways to align units for Schirru. CoF pretty much guarantees finding it, so there are 2 ways to find him. It has the potential for 3 large removals not counting Schirru. It has Saes + Unicorn. It has lock bait to protect the order units. That deck has synergy all over the place.
The only real weakness I see is the lack of thinning ability. I'm guessing the idea there is to bank on having so many good cards such that you're bound to draw something. The problem would be you could get totally screwed if you drew the wrong cards together and got shit mulligans. It looks like Pumpkins deck so I can understand not caring about this. He high rolls everything
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In terms of the leader synergy... It's quite clear that's an Eithne deck running Brouver because Eithne got nerfed into the abyss. Yeah, Eithne is a dwarf now.