The friend is here. That is why, courage flashes no matter how many times.
Trigger:
Critical
[AUTO](RC):[Counter Blast (1)] At the end of the battle that your unit named "Blaster Blade" attacked a vanguard, you may pay the cost. If you do, choose up to one unit named "Blaster Blade" on (RC), [Stand] it, return this unit to your deck, and shuffle your deck.