Chatbot the Merciful

Defender
Artificial Intelligence is considered another
player with a starting life total of 20. It cannot
attack its owner and is controlled by its owner. It shares its owner's
lands and library, but has its own graveyard and
hand. When you cast it, it draws four cards. It
cannot take damage, be destroyed, or be exiled.
Its owner can sacrifice it but it is not considered
under its owner's control.