Ruby Storm wins by chaining cheap rituals and cantrips into a lethal burst, and Weather the Storm's Storm ability means it copies for each spell they've already cast that turn, so holding it until they're deep into a storm chain nets a huge burst of life to survive the kill attempt. Relic of Progenitus can exile a card from a graveyard each turn to slow their Big Score and Electric Revelation flashback recursion, though it won't stop their primary engine since most of their payoffs don't rely on the graveyard. Annoyed Altisaur and some Malevolent Rumble copies are too slow and are the easiest cuts in a matchup decided by whether you can survive the first big turn. Keep your mana acceleration to pressure them before they assemble the full combo.