As most foes possess low Balance skill modifiers, my PC plans to make the ground slippery using the Frostburn spell ice slick. Then, whenever the foe is dealt damage, the foe must succeed on a Balance skill check or fall down. (My PC will be immune to effect by using the Spell Compendium spell snow shoes.)
However, I don't want the foes to have to succeed on Balance skill checks to remain standing only when my PC hits those foes. No, I want foes also to be forced to succeed on Balance skill checks or fall down whenever those foes hit my PC!
For example, my PC's on the ice slick effect and an ogre comes up to my PC so that the ogre's also on the ice slick effect, and the ogre wallops me. My PC's still dealt damage, but my PC doesn't fall down because of the snow shoes effect, but my PC has this thing that deals the ogre damage whenever my PC is hit, so now the ogre must succeed on a Balance skill check or else he'll fall down. The ogre fails and falls down, and I laugh at him.
What I need is the thing, be it a spell or magic item. Both the spells hamatula barbs and investiture of the orthon create an effect that deals damage to a foe whenever the foe strikes the subject, but those are too high-level for my PC, and buy retaliation armor is too expensive.
Is there a level 0, 1, or 2 cleric spell that has a duration longer than 1 round per level that causes the subject to deal damage to a foe when the foe strikes the subject? Alternatively, is there an inexpensive magic item that does this? Ideally, the damage the effect deals should be either untyped damage or sonic damage.
Note: I know optimizing for getting hit is stupid. I also know this won't work against flying enemies.