Sitter Bobtail

:Sentinel :[Choose a card from your hand, and discard it] When this unit is placed on from hand, you may pay the cost. If you do, choose one of your units with "Honorary Professor" in its card name, and it cannot be hit until end of that battle. :When this unit is retired from , choose any number of cards from your soul with "Honorary Professor" in their card names, and put them into your hand.