Sorcery, 4R (5)
Uncommon
Pyrotechnics deals 4 damage divided as you choose among any number of target creatures and/or players.
"Who says lightning never strikes twice?"
—Storm shaman
Illus. John Avon

10/4/2004: You can assign damage to multiple targets and are not forced to assign the same amount of damage to each target.
10/4/2004: You can't do fractional points of damage.
10/1/2008: The number of targets must be at least 1 and at most 4. You divide the damage as you cast Pyrokinesis, not as it resolves. Each target must be assigned at least 1 damage.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern