[quote=@LunarStandard]
<Snipped quote by Ammokkx>

We never did get the effect for Speed World - Neo. They never even used a Spell Card in the one duel it showed up in.
[/quote]

Shun used RUM's. They most certainly did use spell cards.

EDIT: oh wow. It literally only says it can't be destroyed. The fuck are they going to do if it gets bounced back into the hand or shuffled into the deck?