Decks that counter Ice Barriers:
1. Ninja -> Can use Ninjutsu Art to dodge magic triangle (They don't get to special summon their Boss monster and are stuck with their bricky hands)
2. REBD Combo: Champ Vigil shut them down completely.
1. Target back row, even when they activate it, it still count.
2. Good luck with the draw. It will be like WCS, Op combo that couldn't consistently draw them will end up with low win rate.
Champ Vigil? Fight that 🔥 once, still win. I just have 2 Magic Triangle in hand because I start 2nd. Even when the first one got counter, Ice barrier can easily search for another one.
You don't always start with 2 Magic Triangles, and it is not easy to search for another Magic Triangle when your first one got negated.
The thing with Magic Triangle is that it requires 3 different monsters in your hands so Ice Barriers players usually lack decent backrow. Both Ninjas and REBD players can still comes back because they often have more backrow than Ice Barrier players.