Not a CBA map, but you’ve described something somewhat similar to what Rambit CB Gold is – you get Kings with kills/razes, which spawn at the bottom of the map.
You would use those to get Imp, get extra castles for production, or for every 2 Kings you could get 1 king at the super unit area at the top of the map to redeem for a hero unit to spawn.
Subotai and Charles Martel were the usual early heroes to redeem, before eventually getting Harald Hardraade or Genkhis Khan.
Eventually you would use the kings in the top area to get a power up when units are on the middle hill, or if you had enough – global power up.
You lost if the pyramid in your base got destroyed.
I’ve not seen it on DE, but I used to play it a lot along with classic Land Nomad (where you only had enough wood to build a lumber camp to start with, boars in groups of 3, deer in large groups and berry patches were in the map gen) on GameSpy Arcade and Voobly.
On DE the closest to Rambit CB Gold that I’ve found is CBA KingTe, but it’s bit different base layout wise.