Blood Curse Puppet

As part of the action to cast this spell, you place a drop of the target's creature's blood on a puppet, creating a bloodcurse which binds the creature to the puppet, which has an AC of 10. For the duration, whenever the puppet takes damage the cursed creature takes the same amount of damage.
Additionally, when you are hit with an attack, or an effect that causes you to take damage, you can use your reaction to take damage as well.
If you drop the puppet, the spell ends. If the cursed creature dies while the spell is active, the puppet is instantly reduced to ash.