“Ruby Storm is a red-green ritual storm deck. Goblin Anarchomancer and Thornscape Familiar reduce costs, Desperate Ritual, Seething Song and Manamorphose make mana, and Glimpse the Impossible, Reckless Impulse, Wrenn's Resolve, Big Score and Electric Revelation dig for the big turn. Its only maindeck win condition is Seize the Storm (2 copies, plus flashback): a turn that fills the graveyard with instants and sorceries makes a huge trampling Elemental token, and First Day of Class gives that token haste the same turn. The cost-reducer creatures are small 2/2 and 2/1 engines, not a clock, so cutting Seize the Storm leaves the deck with no way to win.”
Missing sideboard cards? The full 15-card sideboard runs about $26.45.
Buy sideboard on ManapoolWeather the Storm gains 3 life per copy of itself cast that turn via storm, giving real cushion against Fiery Temper, Lightning Bolt and the Guttersnipe/Kessig Flamebreather damage engine. Red Elemental Blast has no legal blue targets here since the opponent's manabase is entirely Mountains, so it stays in the sideboard. First Day of Class is a weak haste enabler when racing isn't the plan, and trimming Electric Revelation reduces reliance on card selection in a matchup decided by life total. Keep both Seize the Storm and all core ritual pieces, since this remains a race the storm turn should still try to close out or at least stabilize behind.
Red Elemental Blast is excellent here, countering Counterspell, Dispel, Brainstorm, Lorien Revealed and Spellstutter Sprite, or destroying Baleful Strix and Ninja of the Deep Hours. First Day of Class is the cut since haste matters less against a control deck that is more likely to be racing to disrupt your storm turn than to block it. Keep both Seize the Storm, as it remains the only way to close the game once a ritual turn resolves through their counterspells. Prioritize sequencing rituals to bait Counterspell before committing to the real storm turn.
This is a glacial creature-combo mirror race where neither deck interacts much, so Weather the Storm's life gain (multiplied by storm count) buys turns against their incidental damage from Lotleth Giant and chip damage while you assemble your own storm turn. Electric Revelation's extra selection is less necessary against a deck with no counterspells or removal forcing you to dig around disruption. Keep Seize the Storm at 2 copies untouched, since this matchup is a pure race to go off first and the Elemental token is the only clock in the mirror of go-big strategies. Guttersnipe is not worth bringing in since its 2/2 body does not meaningfully pressure their slow gameplan faster than just resolving a storm turn.