The strategy is to get out the defender of the ice barrier (to not be attacked), Dai-sojo of the ice barrier (to be able to use dark hole) and General Raiho of the ice barrier (to some what negate monster effects). You can only use this effect of 'Brionac, Dragon of the Ice Barrier' once per turn. They focus on stymieing the opponent's attackers with their defensive monsters and plenty of Spell/Trap Cards. Their team symbol resembles a hexagonal snowflake.
Credit to Tyrrikz Gaming for Deck and Strategy submission. You can discard any number of cards to the GY, then target the same number of cards your opponent controls return those cards to the hand. 'Ice Barrier' ( () () () Hykekkai) is an archetype consisting of WATER monsters resembling, for the most part, famous concepts, figures, warriors, and mythological beings of different Asian cultures.