Stealth Rogue of the Silk Umbrella, Shizune

: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 vanguards that is being attacked, and that unit cannot be hit until end of that battle. : 1 When the attack of your unit with the shadowstitch ability hits a vanguard, you may pay the cost. If you do, return this unit to hand.