Unity shader for tiled landscape

I need a Unity3d shader for my tiled landscape. It shall be mobile (performance needed), preferable Vertex-lit. It will receive several atlases of tile pack (albedo, normal, self-illuminate). 1. It shall works like mobile diffuse (no specular). 2. It should receive standart Unity shadows. 3. It should support Unity baked light. 4. And the main feature - it shall use 3 UV sets, that I will change proceduraly. So, every polygon will have 3 UV sets (I assume uv0, uv1, uv2, but dont know what uv is used for baked lighting). It shall normally mix/override this UV sets using transparency, like layers in photoshop. For example, check my exapmle image attached.