@ Airwalkrr: I haven't run into too many DMs who are big fans of creating new spells ... or else, this would indeed be the fun way to solve this problem.
Herzog: This may not be what you need, but Shard Storm in SpC creates a burst of force energy (in the shape of sharp, pointy crystals) within a burst that repeats its damage each round. I believe it's 3d6 force damage. You can suppress the burst as a free action each round, but if you don't, it hits that exact same area each turn for 3d6 damage -- great for monsters under the effects of hold monster, or Evard's, or ...
Arcane Fusion (only if you're a Sorcerer) allows you to cast a level 4 (or lower) and a level 1 spell for the cost of 1 standard action and as your 5th level slot. There are a rather large number of combinations for that ...
Whirling Blade (Sor/Wiz 2) doesn't let you attack multiple TIMES, but it attempts a basic attack roll against every enemy in a 60' line, so ... it could hit multiple people.
Even better than Persistent Blade is Sword of Deception (Sor/Wiz 4) from SpC, which will impose upon those it hits a penalty to that creature's next saving throw. The problem with Sword & Blade are that they will likely die if they attempt to strike a creature with Spell Resistance ...