Radstorm

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.

Some spells and abilities that cause you to proliferate may require targets. If each target chosen is an illegal target as that spell or ability tries to resolve, it won’t resolve. You won’t proliferate.

Spells cast from zones other than a player’s hand and spells that were countered or otherwise failed to resolve are counted by the storm ability.