- If Pidgeot attacks with "Headwind" against Yanmega with the "Insight" Poke-BODY, will "Headwind" increase Yanmega's attack costs or will "Insight" reset them to zero?
- If an Attack Cost is set to zero by an effect, it cannot be increased. Note this is different than an Attack Cost that was reduced to zero by subtraction. Once a Pokemon's Attack Cost is set to zero by an effect, it stays at zero until that particular effect wears off.
Source:
PUI Rules Team (2011-09-29)