Legends Passed Down, Thor

Play this with [COST][Counter-Blast]1] if you have a vanguard with "Thor" in its card name! Choose one of your vanguards, until end of turn, it gets [Power] +10000, and your opponent cannot call sentinels from hand to (GC) for the battles this unit attacked. If your opponent has no front row rear-guards, it gets [Power] +20000 instead of +10000.