Rel
Liquid Awesome
I posted a thread about this a year ago or so. The concensus then and my belief now is that this becomes VERY powerful if you don't require that the cubes be touching. In my particular situation I had the party Wizard who had bought a Metamagic Rod and several times per day he was dropping Lightning Cubes (sometimes EMPOWERED Lightning Cubes) all over the battlefield. Since it was very rare for there to be more than four distinct pockets of bad guys at once, he was hitting virtually every single enemy combatant each time he did this. And to top it off, the smaller individual areas made it much easier for him to position them so that they didn't hit any allies. After a couple sessions of that and getting some responses to my thread, I ruled that they had to be touching cubes.
He still got tons of use from the Rod and the other party members occasionally got to kill something.
He still got tons of use from the Rod and the other party members occasionally got to kill something.