anyone run all infantry mage group?

With your Nino, you should definitely make sure to get the most of of her Blade tome. The Drive Skills don't increase the damage of her Blade tome. Assuming Inigo has his base kit, you're improving Atk and Spd but don't have anything for Def/Res. I recommend running Rally Def/Res on one of your heroes to maximize the Blade tome. That said, your team dies pretty hard to any physical damage, especially a Res tank. I recommend getting a physically resilient mage in the mix. Close Counter would be ideal, but a little expensive for a team that's just for funsies. Slapping the Close Def seal on a tanky mage would be enough even without Close Counter.

Edit: Some recommendations for mages are W!Tharja, S!Camilla, Henry, Boey M!Robin, F!Robin, Merric and Sofia. Excluding W!Tharja and S!Camilla, they're all available at 3 or 4 stars and have high Def stats with 28 being the lowest.

Sanaki might want to keep Hone Atk with Hone Spd seal to buff Nino, or Inigo can do that role as well as a dancer + Brave Lyn and The Rein counter perhaps. Delthea can keep Drive Atk to help all her fellow mages with some extra firepower. Sanaki with her high res could maybe run a ploy skill and/or ploy seal (although my Nino is the one with Spd Ploy and Atk Ploy seal). Nino could also use Drive Atk to help her teammates probably.