Undertow 
Enchantment
$1.62 #31940 0.00 32.4 years
Creatures with islandwalk can be blocked as though they didn't have islandwalk.
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Cards similar to Undertow 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.
Crevasse96%
$1.45↓#318690.31↑32.4 years
"Creatures with mountainwalk can be blocked as though they didn't have mountainwalk."
Quagmire96%
$1.78↑#316790.21↑32.4 years
"Creatures with swampwalk can be blocked as though they didn't have swampwalk."
Deadfall96%
$1.49↓#317390.0032.4 years
"Creatures with forestwalk can be blocked as though they didn't have forestwalk."
Gosta Dirk96%
$18.66↑#309270.0732.4 years
"Creatures with islandwalk can be blocked as though they didn't have islandwalk."
Staff of the Ages95%
$0.57↓#316660.0031.4 years↓
"Creatures with landwalk abilities can be blocked as though they didn't have those abilities."
Great Wall95%
$1.30↓#308700.0532.4 years
"Creatures with plainswalk can be blocked as though they didn't have plainswalk."
Ur-Drago94%
$18.27↑#312040.0032.4 years
"Creatures with swampwalk can be blocked as though they didn't have swampwalk."
Lord Magnus94%
$3.45↑#309380.24↑32.4 years
"Creatures with forestwalk can be blocked as though they didn't have forestwalk."
Street Savvy78%
$0.05↓#301220.20↑20.5 years↓
"Enchanted creature gets +0/+2 and can block creatures with landwalk abilities as though they didn't have those abilities."
Merfolk Assassin78%
$0.34↓#298100.10↑32.2 years
"
: Destroy target creature with islandwalk."
: Destroy target creature with islandwalk."
Mystic Decree72%
$0.97↓#25317↑0.32↑31.1 years↓
"All creatures lose flying and islandwalk."