yes or no?

Not really. Only one member in Travincal comes to mind and even that mob doesnt spawn every run

not really, no

i use it on cold sorc for pub games sometimes incase some broke randoms can't afford, but there are much better options

isnt doom better?

-res can't break a monsters immunity @garra

that being said it probably breaks some at least? havent played much cold sorc idr
infinity doesnt break all immunities in general; some light enchants cant be broken with it

first answer: yes

second question: how often?

second answer: seldom

I think Doom is better option

-res doesnt break immunes

Doom is not good

preach