5/5 for flavor. I mean, the Great Wall did stop a whole lot of plainswalkers, if you think about it. Now we need another card:
Hadrian's Wall 
Creatures with mountainwalk can be blocked as though they didn't have mountainwalk.
Posted By:
Morgaledh
(9/10/2012 8:05:55 PM)
Not "Great" by any stretch of the imagination...
Posted By:
Arachnos
(9/17/2012 7:33:49 PM)
Still would be unplayable at negative mana costs.
Posted By:
ultratog1028
(2/9/2013 4:15:08 PM)
only 10 cards have plainswalk...
Posted By:
enjoy
(3/2/2013 8:56:19 AM)
YES! SCREW YOU GIDEON AND JACE, I GOT A GREAT--
wait, what do you mean it's not like that
Posted By:
FourEx
(3/29/2013 10:02:37 PM)
One of the most powerful cards ever printed, this card completely stops mighty planeswalkers from...
Wait, plainswalkers? Yeah, whatever, you go with that, I'm outta here.
Posted By:
Aquillion
(5/5/2013 8:45:29 PM)
It would have to draw you a card and cost 0-1 to make it even mildly playable.
Posted By:
Lifegainwithbite
(5/23/2013 2:40:41 AM)
How is plainswalking even a difficult thing to do in the first place? You're literally just walking across a field with some moderately high grass. Compare it to:
Mountainwalk: You're climbing a freaking mountain that probably has lava shooting out of it or rocks falling off it.
Forestwalk: You're traversing through a thick forest filled with poisonous things that's probably easy to get lost in.
Islandwalk: You're crossing a sea or ocean that could be stormy with powerful waves and wind.
Swampwalk: You're navigating a foul mass of rotting things that probably has god knows how any diseases lurking in it.
The only danger plains pose is if someone ... (see all)
Posted By:
tankthebest
(6/19/2013 10:48:37 AM)
This could of been another moat.... Really this should of been moat. But then what would moat do? Glad I own a moat and not this though. Phew.
Posted By:
MightyWhitey
(3/2/2014 5:59:28 PM)
Number of cards in Magic history with Plainswalk:
10.
Number of plainswalkers up to and including Legends:
1 (Righteous Avengers)
Number of cards in Legends that disable Plainswalking:
2 (Great Wall, Lord Magnus)
Posted By:
Ancient-Toaster
(4/3/2014 10:19:21 PM)