Hexagon Mutant, Honeycomb Queen

: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. Dark Device (Active when your opponent has no units in the same column as this unit):［ 1］ When your unit's attack hits a vanguard, you may pay the cost. If you do, return this unit to your hand.