Stormtide Leviathan 
Creature — Leviathan
$0.51 #2864 0.94 16.1 years
Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
All lands are Islands in addition to their other types.
Creatures without flying or islandwalk can't attack.
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Cards similar to Stormtide Leviathan 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.
Yavimaya, Cradle of Growth90%
$15.42↑#77↑0.29↓5.3 years↓
"Each land is a Forest in addition to its other land types."
Urborg, Tomb of Yawgmoth89%
$53.04↑#73↑0.49↓19.6 years↑
"Each land is a Swamp in addition to its other land types."
Blanket of Night88%
$1.11↑#16594↓0.33↓29.6 years↑
"Each land is a Swamp in addition to its other land types."
Magus of the Moat82%
$7.82↑#7533↓0.9919.3 years↑
"Creatures without flying can't attack."
Moat82%
$891.56↑#13261↓1.52↑32.3 years↑
"Creatures without flying can't attack."
Realmwright82%
$0.28↓#18664↓0.14↓13.6 years↓
"Lands you control are the chosen type in addition to their other types."
Prismatic Omen80%
$3.21↑#3511↓0.26↓18.3 years↑
"Lands you control are every basic land type in addition to their other types."
Living Plane76%
$210.29↑#17827↓0.9732.3 years↑
"All lands are 1/1 creatures that are still lands."
Nature's Revolt76%
$5.30↑#13033↓0.80↓28.9 years↑
"All lands are 2/2 creatures that are still lands."
Swampbenders76%
$0.39↓#17639↓0.00↓0.8 years↓
"Lands you control are Swamps in addition to their other types."
Dryad of the Ilysian Grove76%
$9.26↑#303↑0.49↓6.6 years↓
"Lands you control are every basic land type in addition to their other types."
Conversion75%
$0.24↓#26556↓1.18↑33.1 years↑
"All Mountains are Plains."
Natural Affinity74%
$4.80↑#12083↓0.65↓26.9 years↑
"All lands become 2/2 creatures until end of turn. They're still lands."
Celestial Dawn74%
$0.47↓#17265↓0.07↓29.9 years↑
"Lands you control are Plains."
Nightcreep74%
$0.29↓#23825↓0.61↓20.3 years↑
"Until end of turn, all creatures become black and all lands become Swamps."
Glaciers74%
$0.54↑#29115↓0.69↓31.3 years↑
"All Mountains are Plains."
Living Lands73%
$0.47↓#17114↓0.53↓33.1 years↑
"All Forests are 1/1 creatures that are still lands."
Melting72%
$0.23↓#31825↓0.33↓31.3 years↑
"All lands are no longer snow."
Sea's Claim72%
$0.14↓#20959↓0.10↓23.9 years↑
"Enchanted land is an Island."
Energybending72%
$0.27↓#6404↓0.00↓0.8 years↓
"Lands you control gain all basic land types until end of turn."