You got that right didnt use any archer. Just use all your premium currency in gold. Gatcha is not really needed thx to 5* shards in a daily basis.My advice forget gatcha, only use tickets when they give, spend all to upgrade castle buildings to fasten pve progress and arena.
I used 45 kenshin, 45 Yukimura, 45 5* katana girl, 45 Javier and a crappy 40 4* mage I dont know why I use...no archers basically as you can see