Voodoo doll

When you cast this chose a player/planswalker to bind it to. This artifact can be used like a creature to block an attack from a creature. When it takes damage it's bound player/planswalker takes the same amount of damage. When it takes damage it is destroyed.
"I heard there is a doll that looks very similar to the Guide somewhere in the underworld. I'd like to put a few rounds in it."
- The Arms Dealer