[CONT]: Sentinel [AUTO]:[Choose a card with "Duo" in its card name from your hand, and discard it] When this unit is placed on (GC), if you have a vanguard with "Duo" in its card name, you may pay the cost. If you do, choose one of your units that is being attacked, and it cannot be hit until end of that battle. Choose up to three cards with "Duo" in its card name from your drop zone, and put them on the bottom of your deck in any order. If three cards with the same card name were put, draw a card, and Counter Charge (1).