A map filled with only the most aggressive warmongering civs: Warmonger World

[B.A.Start]

https://www.youtube.com/watch?v=6W8yCZLFEDE&list=PLhJDYadvu5RMMS-tqxwqLoqrWzEA-Q0nj

GAME SETTINGS
- Immortal
- Continents Plus
- Standard Map Size (8 Civs)
- Standard Speed
- 12 City-States
- Only Warmonger Civs

The Huns are obviously the most offensive civilization in the game, always looking for a domination victory rather than other victory conditions. They are the only civilization which has a siege weapon in the Ancient Era, and are thus able to combine two siege weapons in a single era (Battering Ram and Catapult)

Add to that the powerful Horse Archer, also available in the Ancient Era, and you get an offensive juggernaut.

 

[Snipes]

I've done this before and it's actually very easy since the other civs are always fighting each other they fall behind on infrastructure and tech. Also, the very high warmonger civs tend to have very low religion priority so it allows to you get first religion/enhance on deity even without a religious civ.