Brain Freeze

Target player mills three cards.
Storm (When you cast this spell, copy it for each spell cast before it this turn. You may choose new targets for the copies.)

Mystery Booster 2

Kaito's understanding of technology is just as deadly as his blade.

Secret Lair Drop

The List

Vintage Masters

Target player puts the top three cards of his or her library into his or her graveyard.
Storm (When you cast this spell, copy it for each spell cast before it this turn. You may choose new targets for the copies.)

Scourge

Target player puts the top three cards of his or her library into his or her graveyard.
Storm (When you play this spell, copy it for each spell played before it this turn. You may choose new targets for the copies.)

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.

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.

Spells cast from zones other than a player's hand and spells that were countered are counted by the storm ability.

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.

You may choose new targets for any of the copies. You can make different choices for each copy.