Several things.
First, no one in this thread works for Plarium, we are just showing you what worked for us. I built that team AFTER beating Bommal with a different one, paying silver to upgrade all fresh gear that wasn't "endgame" and I did it to try and help others with their attempts.
Second, building up Armiger can do nothing but make your account better, he is amazing in Ice Golem, and equally amazing with every spider, whether regular or doom tower. He's great anywhere you want to drop Turn Meter and he does that really well. So that's really good you decided to work on him.
Third, it is normal to have to spend time ranking food up to get a 6 star. At this point with the login rewards changes, you would only have a single extra 5 star chicken, and that is ONLY if you're over 270 days. Are you? Cause if so, you have the champs you need to beat Bommal 10, without really breaking a sweat. Just dump damage into him and kill him before his bombs go off. Bommal 90 is a different story, but Bommal 10 is no worries for a true midgame or endgame account.
Lastly, there's a lot of subsitutions you can make in Armiger's spot. Put any champ in there that hits single targets hard and can survive the waves. Some commonly used rares or login champs that can do that are Athel and Dark Athel, Coffin Smasher, Executioner (farmable), and Frozen Banshee, as well as any other starters you've pulled. If we don't limit ourselves just to starter or login champs, just use whatever damage dealing champs you're most fond of, especially ones that can CC down the waves with turn meter control, freezes or sleeps.
Here's the thing, I showed you one team with only Uncommon and Login Champs, but you get the benefit of using whichever epics or legendaries you've pulled. Just put in one that you like, and use it around the basic framework you see in my post.
Good Luck!
Quinn is by far one of the most intelligent players/people I've met. She can somehow turn a pile of garbage ( like my account) into something useful. It's amazing! So if she says it can be done with f2p champs that I've ignored, I believe her.