1. Gellius is the best tank in the game (yes better then deine) and hes the only unit i wouldve wanted more then sherry when i got her.
2. I kinda know your team u should be already abel to do the map 8 2*s its pretty easy realy. U dont even need a good tank for it (u know thats where i suck)
Use this guide
Nasu. His 2* guide on the 7th map is also kinda easy if u can play the switch game, i just always fcked up and lost my themis/sherry but since i dont need that second star anyways i just leave it with that.
Btw. update on my farm results: I got 4 plat amors and 1 daniela... xD. If that keeps up i will have 36 plat armors befor i get the 9 freaking silver archers that i need lol
EDIT: Another note from me in addition to nasus guide. I know that u have zola, u can easiely switch the third mage up with zola she does actualy deal more damage then any gold mage could. I used her at 50cc35 level and she was stronger then my 50cc60 cyrus cause most enemys on that map have litelary 0 defence. You can even do the map like in that guide without placing any tank at all. I actualy had to do the map without placing a tank to 2*