These cards have the potential to be really good, but there's one problem: in all of Magic, there are only 34 creatures with islandwalk, 4 with plainswalk, 33 with forestwalk, 20 with mountainwalk, and 44 with swampwalk (including creatures that have to pay to get it). So, these cards doesn't do much. That's really all I can say about these things. That's all that can be said about them.
Pros: Allows creatures that couldn't be normally blocked to be blocked
Cons: There aren't many creatures that are affected (135 combined)
Rating: 1/5 (because the forestwalk and swampwalk nullification can be useful in really limited situations)