i heard BYOB iz good
just remember,
1 flagger / healer
( all of the following must shadow steap lots and be able to keep them selfs alive)
7 frontline ^^
nah but seriously obs ftw, just mod the builds to how you like them.
7 or even 8 warrior gvg parties are mostly (almost always is maybe better) made for frozen isle.
also 3-way splitbuilds are mostly made for this hall.
normal split builds works wonderfull also, and are better on other halls aswell as on frozen isle.