Deity Zenith is a editor like but very easy to use Starcraft 2 mod that made for fun/roleplay games where players can control everything on map plus players can spawn anything from whole Starcraft 2 and Warcraft 3 games (Frozen Throne included).
Deity Zenith mod is based on Totemhokem's "DEITY (Wasp mode II) mod" that had a mechanic makes player 1 on team 1 god with all spawn/control abilities meanwhile other players are normal players so since i didnt wanted to break this mechanic on Deity Zenith, still only player 1 on team 1 gets access to Deity powers at start of map but if you use command -alldeitymode then everyone gets access to Deity powers so it becomes like free play map where everyone can spawn/control anything (you can check rest of text/key commands in objectives section when you play a map with Deity).
Deity spawnables list includes nearly everything and growing more day by day this means you can play with unused or used but uncommandable units which you never saw or never used before (probably) like Terra-Tron, Xanthos, and Gorgon class battlecruisers including Dominion flagship, Void seeker, Griffin, Emil Narud (and all of unused stuff reworked to fit for needs) and lots of more waiting for you so play like the way you want to play .
Ever wondered how would it be like if you played campaign maps with warcraft 3 heroes instead starcraft 2 or going back to a map you stuck before and summoned some extraordinary allies ? or what if elite bots in a 2vs2 had void portals at their back while you play as more than 1 race at same time (coop races included) ? there is no limit for possibilities in Deity.
Example gameplay videos below to show that what you can do with Deity and its capabilities.
Since Deity Zenith is a extension mod you can pick any "Melee" category map in custom section and make a lobby with this mod just like playing with any other mod. Here is a quick tutorial for beginners in case you dont know how to play a map with mods. You can also bookmark it after you find on mod list so you can easily find it later.
Just like playing any melee map, in "Melee" category use search bar to find campaign maps by their map names (for example: "Liberation Day" for 1st liberty mission) then make lobby with mod and select Deity Zenith in mod list.
Tip: Check map maker's name "Schmause" he has most of campaign maps as unmodified so will work best with mod.