Frosth get’s my vote. But really depending on who you’ve got in terms of pairing Zocc/Frosth with respective team.
My Frosth Team:
Finley-Ariel-CMagni-Frosth-Fenrir
Frosth small mana gain is just dope to the whole team. Ariel provides sufficient healing and mana boost on top of Frosth mana gain. I’ll be having Morel replacing either Finley/Fenrir/CMagni, yet to decide.
My green team (don’t have Zocc)
Heimdall-Bertila-Atomos-Telluria-Lianna(going to be replaced by Phileas Fogg).
Remember, Frosth is a fast mana generating hero and has an Element Link very usable on your blue stack, ideal if you are a monoblue attacker, and especially more so if you have other ice heroes that summons minions, i.e. Krampus and Glenda.
May I suggest something? Just my 2 cents. Your green team is phenomenal with sniper, debuffer, defence down, healer, dodging… Margaret simply don’t fit in as Kadilen does the job perfectly already. Strip Margaret, replace her with Zocc, and max Frosth with Margaret’s emblem.
I’d spilt them unless you plan on using Frosth in your defense. Zocc is easy to beat on defense but that skill is so useful when raiding and attacking in wars.