The EPIC Storm needs to resolve Burning Wish or Echo of Eons and chain rituals into Tendrils of Agony, so proactive discard is your best tool. Unmask strips their key piece (Burning Wish, Gamble, or Echo of Eons) for free before they can go off, and you can usually find a spare card to pitch given your card-neutral engine. Shenanigans is a Sorcery that can destroy an artifact mana source like Chrome Mox or Mox Opal, slowing their explosive starts and buying you time to assemble your own graveyard plan. This is a pure race matchup, so prioritize disrupting their combo turn over grinding value.