1 Tuner + 1+ non-Tuner monsters 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. You can only use this effect of "Brionac, Dragon of the Ice Barrier" once per turn.
After returning your opponent’s cards to their hand, attack and deal damage with Hino Kagu-Tsuchi forcing your opponent to discard their entire hand so they cannot reuse the bounced cards.
Brionac only needs generic synchro materials making his summoning fairly easy. Here are some examples of easy level-6 Synchro plays. Blackwing - Blizzard the Far North can revive a level-4 Blackwing monster. Psychic Wheeleader Special Summons himself when you control a level-3 monster.
Quillbolt Hedgehog can revive itself when you summon a level-4 Tuner monster. When you control a level-4 monster, you can Special Summon Plaguespreader Zombie.