Q
With no power built up in my power charger, and a character without its power cost met in my battle zone, I set Corridor
.
What's my attack in the battle?
A
Your attack in this battle is 0.
Even if the power cost of an enchant card that raises attack is met, a character card without its power cost met "can't attack" (its attack is 0), so the "Attack +20" effect doesn't take effect.