Mainly a go 2nd deck but you can go 1st and set a nice 2 to 3 interruption with a possibility of having a battle trap or follow up for next turn, best board consists of the latter+ barrier statue for maximum stun potential
Brigade engine obviously helps you dodge handtraps (you still die to droll)
Small World is for testing but i think it works really well with the deck
Gamaciel is important for small world target and recyclable via sun mou removal
TLDR: Ancient Warrior is slept on and imo you can sometimes with the right build beat meta stuff since people dont know the matchup......yet
Easy to pick up, intermediate difficulty to master, you can pick the deck and once you get going build it however you want
Edit: forgot to add pot of prosperity, but yes you can replace extrav with it, i think prosperity is better but extrav aint half bad either