How do I do the 'video-in-video' effect?

How many times can i activate gagaga gardna's 2nd effect per turn?

• http://fc03.deviantart.net/fs71/f/2012/053/6/8/gagaga_gardna_by_cardhunter-d4qhjad.png this card is gagaga gardna its second effect is that i can discard a card to have it survive a battle when its attacked...my questions 1 can it be during my opponents turn 2 how many times can it be activated per turn (like if they attack it more than once 3 does it have to be special summoned from effect 1 for effect 2 to be activated 4 does this discard count as cost or effect

• Answer:

  1. Yes ( There is no way your opponent can attack you during your turn....) 2. As many time as you want, there is no once per turn or so. 3. Yes, I mean, you obviously can't black an attack when it's in your hand....... 4. It's a cost