Forum:Need Total Clarification on Rai-Oh

I know that Thunder King Rai-Oh's negation ability can't be stopped by cards like Skill Drain or Fiendish Chain. But now I want to know why? I know its a cost, and can't be negated. The questions I have are below.

1) Where does Rai-Oh's Negation Ability activate and resolve? 2) Can a cost ever be negated?

--99.157.218.117 (talk) 02:28, March 9, 2012 (UTC)