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

Any given reason beyond just "Fuck pendulums"? 'Cause I find XyZ's to be a much bigger game breaker personally.
[/quote]

mostly Arc-V's plot, really. Since they weren't a card type until Yuya suddenly made them with magical MC powers, we can just stay away from that.
Xyz aren't really broken as a card type, but certain Xyz are certainly broken to hell. Though, after looking through them, most of the OP Xyz are numbers. I guess Cxyz will also be banned, since those were specific to the Barians.