Ruby Storm needs to chain red rituals and card draw (Desperate Ritual, Seething Song, Big Score, Electric Revelation) to generate the mana and cards needed for a storm kill, so Hydroblast can counter or destroy nearly every key piece of their engine, including Desperate Ritual, Seething Song, and Goblin Anarchomancer, which is red and green. Thornscape Familiar is only green, so Hydroblast can't touch it. Envelop counters their sorcery-speed card advantage spells like Glimpse the Impossible, Reckless Impulse, Wrenn's Resolve, and Seize the Storm. It can't hit their instant-speed rituals or Big Score, so save it for those sorceries to disrupt their card flow before it snowballs. We cut Reckoner's Bargain, Baleful Strix, and Blood Fountain for being too slow and not interactive enough against a combo deck that wants to go off quickly.