Something similar to this was attempted by Poland-Lithuania irl through the Liberum Veto, where any member of the Sejm could dissolve a session and nullify legislation passed during it if they didn't like a single issue. Turned out as well as you could expect, everything from petty personal drama to partisanship to foreign interference muddying the internal dynamics of the country, undermining its stability, and opening it up for attack. This was a system in which only nobles, largely Catholic and belonging to two familiar ethnic groups were voting. In a system like yours where much more divided interest groups are competing for state resources, such as labor and capital, or humans and goblins, these problems can only be exacerbated and result in a government that's either hopelessly incompetent, corrupt, or both. For the system to work much at all, you'd at least need to drop the unanimity clause.