Ahaha, an area of expertise for me. Depends on what the NR timer is. Personally, I prefer Celt because they have a better boom and Celtic onagers can afford to trade with Korean ones because they fire faster and are created faster + have more hp. You'd want at least one Paladin civ, most likely Spanish but Teutons also work. Mongol and Saracens are pretty expensive in terms of having a gold heavy main unit (Mangu/Mameluke) + having to make siege. They're not as destructive as a Paladin or an Elephant in terms of pure attack power, but in the right hands, anything can happen. Another popular combo is Elephant + archer civ. Try Turk/Chinese/Britons/Mayans, but Mongols are definitely a top pairing with EWE. Avoid Vikings and Hun, they aren't as strong when you play NR, which I'm beginning to get tired of. Also, make sure you have a good trade, aim for at least 40 carts by 40 minutes. Unless you storm through the competition, which I'm sure you will, because I doubt many can match your skill level; you'll need gold, and lots of it.
Edit: #1 counter to War Wagons is halb meatshield + siege onager. What better civ than Celts? Weak champs and archers vs 135 hp SO hahahaha good luck.
Edit: #1 counter to War Wagons is halb meatshield + siege onager. What better civ than Celts? Weak champs and archers vs 135 hp SO hahahaha good luck.