I think Garchomp/Altaria is a deck that can win some Battle Roads in less competitive areas, and it surely will do just that, but come a larger, more competitive tournament like Fall Regional Championships, Garchomp/Altaria isnt a deck that is going to win you the tournament, and also probably isnt even good enough to give you a positive chance at making the top cut
But Ice Barriers true strength comes from its Graveyard effect, which allows you to send one Level 5 or higher Water Monster from your deck to the Graveyard and then add any Water Monster from the Graveyard to your hand
Giving this ability on a lifelink flier means that it will be never a bad card
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Commander Decks Explore the void with Commander decks