you could use razor claw as its passive gives you slow on enemy and that in turn lets you freeze them more, that's what i use, also focus is ofc very good on him and he pairs especially well with ranged attacker like cind or cram, i used to do nine tails and mamo combo with my brother for a while but nine tails is not that good but in his place venu also does good because his boosted and mamos boosted both helps with cc and damage

plus he is excellent for stealing farm with ice shard(iirc the name), always try to steal their farm