[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, and it cannot be hit until end of that battle. Choose up to three cards with "Duo" in their card names from your drop zone, and put them on the bottom of your deck in any order. If you put three cards with the same card name, draw a card, and [Counter-Charge 1].