The Flood of Mars 
Creature — Alien Zombie Horror
$0.37 #8563 0.35 2.9 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%
$0.51↑#2863↑0.94↑16.1 years↑
"Islandwalk"
+1 more matching line
Xolatoyac, the Smiling Flood76%
$0.44↑#5017↑0.262.8 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%
$0.21↓#12636↓0.23↓13.1 years↑
"Islandwalk"
+1 more matching line
Eluge, the Shoreless Sea71%
$5.08↑#3047↑0.74↑2.1 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%
$0.16↓#20694↓0.18↓8.4 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%
$0.09↓#22818↓0.00↓12.9 years↑
"When this creature becomes monstrous, target land becomes an Island in addition to its other types."
+1 more matching line