Flusterstorm

Mana cost: {U}
Type: Instant
Set: Judge Gift Cards 2012 #2 (rare)

Counter target instant or sorcery spell unless its controller pays {1}.
Storm (When you cast this spell, copy it for each spell cast before it this turn. You may choose new targets for the copies.)

Flusterstorm has 13 printings, first in Commander 2011 (2011). EDHREC ranks it #309 among Commander cards. It appears most in Vivi Ornitier decks (16,805 on EDHREC). 1 public deck on TCG runs it. It has 5 official rulings.

Legality

commander: legal
legacy: legal
vintage: legal
pauper: not legal
modern: legal
pioneer: not legal
standard: not legal
brawl: legal

Public decks that run Flusterstorm

Political Puppets - Commander 2011, led by Zedruu the Greathearted

Commanders that run Flusterstorm most

Deck counts from EDHREC.

Vivi Ornitier: 16,805 decks
Kinnan, Bonder Prodigy: 13,622 decks
Kraum, Ludevic's Opus // Tymna the Weaver: 10,646 decks
Sisay, Weatherlight Captain: 7,783 decks
Kefka, Court Mage // Kefka, Ruler of Ruin: 7,683 decks
Yuriko, the Tiger's Shadow: 7,428 decks
Urza, Lord High Artificer: 6,862 decks
Glarb, Calamity's Augur: 5,099 decks

Often played with Flusterstorm

Cards that show up in the same decks on EDHREC.

Rulings

2022-12-08: 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: You may choose new targets for any of the copies. You can make different choices for each copy.
2022-12-08: 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: 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: Spells cast from zones other than a player's hand and spells that were countered are counted by the storm ability.