Everyone here says that, in some cases, destroying this card causes Time waster warning. It happened to me when I had tried to use the "Parallel Twister", but why it happens? time??? the card description does not describe a condition about how you should destroy it.
Someone can explains me better pls and which cards should work on this case and why they work after all while others dont.
Because after you send it to GY, there's still another action (destroying one card). Same thing with Storm, Paladin/Guardian of Felgrand, etc. For this to work, there must be no second action. Use Double Cyclone, A Wingbeat of Giant Dragon, or Oops! I tried these three, they worked.
Don't use Witch-Raider as you won't be able to special summon non-HERO.
Witch Raider doesn't work. The summon is the last thing to happen, which causes missed activation timing. Also, you can only have one face-up Castle at a time, per the last line of its effect. Double Cyclone is the best way to destroy a Castle. Another way is to use the effect of Darkblaze Dragon, but you need to target a different face-up spell/trap when activating to avoid missing the timing.
Sometimes, when desperate, I'll use a Wild Tornado to destroy my own Castle, but that's a net -1. When you do that, you have to say No when Wild Tornado asks whether you want to set a spell/trap to avoid missing the timing.
Oh, I forgot one. A fun (and slightly chancey) way to use the second effect is with Magical Hats. If they attack the Castle, it flips face-up, goes to the graveyard, and its effect activates. This catches people off-guard.
Ykharus
True Duelist
