[Requirement] You can activate this if you control a face-up Thunder monster.
[Effect] Destroy 1 Spell/Trap your opponent controls.
Note: The name might be a pun on 先駆/Senku, which is a pioneeer or trailblazer, but replacing the first kanji with one for “flash”, as in “a flash/blitz that opens the path”. The rest of the name is the ever famous “raigeki”, whose Japanese name is the English word “Thunderbolt”, so we’re flipping the name around.