Taking your theme and running a differant way with it, why not make it grant the passive ability Voodoo (like voodoo dolls) to your creatures? I am supposing that this card is being made to address lifes current difficulty with CC and that seems much more helpful than 3HP, especially if the opponent gets it as wll
The Voodoo ability to me is only really useful if your creature has enough HP to survive an attack. Since all but 1 life creatures have < 5 HP, giving a life creature this ability would be, curious.... I wouldn't see any true synergies right off the back.
I named it Voodoo Shaman because it sounded good at the time. He could also be named "Mystic Shaman" or "Tribal Shaman" or just plain "Shaman" if there is too much name confusion with the existing "Voodoo Doll"
However a Spark might cause problems.
I've considered spark. Worst case is a fractal or mitosis spark deck with a shaman. Mechanically, if the shaman is out and you put out a spark, the spark is now 3|3. At any point, if the shaman dies, the spark will die as well. This whole combo rests on the shoulders of an easy to kill 2|2. That's the whole point. Hmmm.... you could quintessence the shaman... but is this any more powerful then the ever rampant Fractal Phoenix or Fractal Devourer? It still requires a duo element, and has no other form of splash-able control, like fire and darkness has.
The other interesting combo I have thought of is shaman + gravity shield. This will stop most enemy creature attacks. Since this combo relies on two elements, an permanent (normally not used) and a weak creature, I feel there are holes enough to exploit and counter-play available.