Very sensible effect. I figure it's only a matter of time until we see it.

Might confuse people into thinking it can't be blocked when attacking planeswalkers (or alternatively into thinking it can't attack planeswalkers at all). I might therefore add "Whenever ~ attacks a planeswalker, it can't be blocked this combat."

Blue really ought to be the colour that gets this first; "protection-weird shit" is one of blue's few remaining abilities.

Apart from that, love it; dislike the txt-speak name but appreciate the joke of it.

A shame that most planeswalker ultimates don't target, though.

can't believe there are only two "Protection from Planeswalker" cards here. and both by me. finally 7 years later WotC prints their first one (Sparkhunter Masticore).

Fwiw, I would see this being white's answer to Planeswalkers, though Wizards put it on an artifact. In Wizards defense, they did try and phase protection for a few years.