Extreme Battler, Headstrong-battle (G-BT06/014EN) [Transcension of Blade & Blossom]

[CONT]: Sentinel [AUTO]:[Choose a card from your hand, and discard it] When this unit is placed on (GC) from hand, you may pay the cost. If you do, choose up to one of your vanguards that is being attacked, and that unit cannot be hit until end of that battle. [AUTO] Generation Break 1 :When this unit is placed on (GC), if there is a card named "Extreme Battler, Headstrong-battle" in your drop zone, choose up to one of your rear-guards, and until end of turn, it gets"[AUTO](RC):[Counter Blast (1)] At the beginning of the guard step of the battle that your vanguard was attacked, you may pay the cost. If you do, move this unit to (GC) as [Rest], and this unit gets [Shield]+10000 until end of that battle.".