The Flood of Mars 
Creature — Alien Zombie Horror
$0.37 #8866 0.18 3.0 years
Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
Water Always Wins — Whenever this creature attacks, put a flood counter on another target creature or land. If it's a creature, it becomes a copy of this creature. If it's a land, it becomes an Island in addition to its other types.
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Cards similar to The Flood of Mars 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.
Stormtide Leviathan78%
$0.49↑#2914↑0.93↑16.3 years↑
"Islandwalk"
+1 more matching line
Xolatoyac, the Smiling Flood76%
$0.46↑#5126↑0.50↑2.9 years
"Whenever this card enters or attacks, put a flood counter on target land. That land is an Island in addition to its other types for as long as it has a flood counter on it."
Colossal Whale72%
$0.16↓#12830↓0.31↑13.3 years↑
"Islandwalk"
+1 more matching line
Eluge, the Shoreless Sea71%
$4.42↑#3149↑0.71↑2.2 years
"Whenever this card enters or attacks, put a flood counter on target land. It's an Island in addition to its other types for as long as it has a flood counter on it."
Navigator's Compass70%
$0.24↓#20834↓0.36↑8.5 years↑
"
: Until end of turn, target land you control becomes the basic land type of your choice in addition to its other types."
: Until end of turn, target land you control becomes the basic land type of your choice in addition to its other types."
Sealock Monster70%
$0.08↓#23116↓0.2013.1 years↑
"When this creature becomes monstrous, target land becomes an Island in addition to its other types."
+1 more matching line