Can I use Hannibal Necromancer's effect to destroy a trap card my opponent just activated?
I'd say it's an ignitiion effect, but the rule book isn't too specific, what a quick effect has to look like. (http://www.google.de/url?sa=t&amp;rct=j&amp;q=&amp;esrc=s&amp;source=web&amp;cd=5&amp;cad=rja&amp;uact=8&amp;ved=0CDwQFjAE&amp;url=http%3A%2F%2Fwww.yugioh-card.com%2Fuk%2Frulebook%2FRulebook_v9_en.pdf&amp;ei=3I7PVJGeGouuU_PSgKgC&amp;usg=AFQjCNGA0UwHs5645XFrSUxvPPOOj30lxA)

So you're not able to activate it during your op. turn.