Talk:Electron Ninja, Shiden/@comment-24423693-20140324114144/@comment-13275021-20140326134422

So, I e-mailed Bushiroad, and you guys were actually right - kind of. As I said, you'll have priority again after Shiden finishes being summoned, meaning you can use his ACT ability right away. However, if your opponent Counters with a card that can remove Shiden from the field in any way (Magical Goodbye for a bounce, Dragonic Thunder for destruction, etc.), then Shiden's "Cyber Analyze" won't be able to resolve, because he's not on the field anymore. As far as I'm aware, nothing has officially said before that a card has to be on the field for its ability to resolve, so that's why I thought Cyber Analyze would resolve even after Shiden was removed.

However, since the ability doesn't resolve at all, you don't have to pay the 1 gauge and discard a «Ninja Arts» card. That's because paying a gauge and discarding a card isn't considered a cost to activate Shiden's Cyber Analyze; the payment is an actual part of the resolution of the ability. And if the ability doesn't resolve at all, then nothing has to be paid.

Thankfully, this means that any ACT ability must function this way. For instance, if you activate Jackknife Dragon's ACT ability to call a monster from the deck, you don't pay the 2 gauge until after your opponent's Counter (if any) resolves. If they Magical Goodbye/destroy Jackknife Dragon with that Counter, no gauge has to be paid. I was worried before that Magic World could sit there and waste all of my gauge. Thankfully, that isn't really the case.