Pyrotechnics | Magic: The Gathering
Formats Pyrotechnics is Legal in
Official Oracle Text for Pyrotechnics
Official Rulings for Pyrotechnics
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.