Crevasse 
Enchantment
$1.47 #31550 0.24 32.3 years
Creatures with mountainwalk can be blocked as though they didn't have mountainwalk.
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Cards similar to Crevasse expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Deadfall98%
$1.49↑#313500.53↑32.3 years
"Creatures with forestwalk can be blocked as though they didn't have forestwalk."
Lord Magnus98%
$3.54↑#306230.38↑32.3 years
"Creatures with forestwalk can be blocked as though they didn't have forestwalk."
Ur-Drago97%
$18.37↑#309850.00↓32.3 years
"Creatures with swampwalk can be blocked as though they didn't have swampwalk."
Quagmire97%
$1.68↑#313520.00↓32.3 years
"Creatures with swampwalk can be blocked as though they didn't have swampwalk."
Undertow96%
$1.63↑#315840.2532.3 years
"Creatures with islandwalk can be blocked as though they didn't have islandwalk."
Staff of the Ages96%
$0.53↓#313240.2931.3 years↓
"Creatures with landwalk abilities can be blocked as though they didn't have those abilities."
Great Wall94%
$1.27↓#305550.04↓32.3 years
"Creatures with plainswalk can be blocked as though they didn't have plainswalk."
Gosta Dirk94%
$18.71↑#307960.40↑32.3 years
"Creatures with islandwalk can be blocked as though they didn't have islandwalk."
Street Savvy82%
$0.07↓#297890.00↓20.3 years↓
"Enchanted creature gets +0/+2 and can block creatures with landwalk abilities as though they didn't have those abilities."
Mystic Decree71%
$1.01↓#25039↑0.3030.9 years↓
"All creatures lose flying and islandwalk."