Flusterstorm

Bracket

• B1 Exhibition — Not in the same deck as its two-card combo partner: Guile
• B2 Core — Not in the same deck as its two-card combo partner: Guile
• B3 Upgraded — allowed: Its two-card combos are not early, which Bracket 3 allows
• B4 Optimized — allowed: No restriction beyond the banned list
• B5 cEDH — allowed: No restriction beyond the banned list

Why

• Two-card combo with Guile (none of them early)

How Lotus Vault estimates a bracket

Bracket: Lotus Vault analysis, with Commander Spellbook flags

Combos

1 known combo, one of them two-card.

• Guile + Flusterstorm
  Produces: Infinite magecraft triggers, Infinite storm count
  View on Commander Spellbook

Combos: Commander Spellbook

Rulings

• 2022-12-08 · Wizards of the Coast
  A copy of a spell can be countered like any other spell, but it must be countered individually. Countering a spell with storm won't affect the copies.
• 2022-12-08 · Wizards of the Coast
  You may choose new targets for any of the copies. You can make different choices for each copy.
• 2022-12-08 · Wizards of the Coast
  The triggered ability that creates the copies can itself be countered by anything that can counter a triggered ability. If it is countered, no copies will be put onto the stack.
• 2022-12-08 · Wizards of the Coast
  The copies are put directly onto the stack. They aren't cast and won't be counted by other spells with storm cast later in the turn.
• 2022-12-08 · Wizards of the Coast
  Spells cast from zones other than a player's hand and spells that were countered are counted by the storm ability.

Rulings: Scryfall · Wizards of the Coast