Spreading Algae 
Enchantment — Aura
$0.23 #23584 0.56 27.9 years
Enchant Swamp
When enchanted land becomes tapped, destroy it.
When this Aura is put into a graveyard from the battlefield, return it to its owner's hand.
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Cards similar to Spreading Algae 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.
Blight90%
$0.26↑#241230.80↑32.3 years↑
"When enchanted land becomes tapped, destroy it."
+1 more matching line
Brink of Disaster87%
$0.06↓#244360.71↑16.6 years↓
"When enchanted permanent becomes tapped, destroy it."
+1 more matching line
Unquenchable Fury86%
$0.39↑#8785↑0.13↓4.5 years↓
"When this Aura is put into your graveyard from the battlefield, return it to your hand."
Brilliant Halo84%
$0.23#191120.41↓27.9 years
"When this Aura is put into a graveyard from the battlefield, return it to its owner's hand."
Uncontrolled Infestation84%
$0.12↓#279901.00↑23.3 years↓
"When enchanted land becomes tapped, destroy it."
Eye of Nidhogg84%
$0.72↑#3671↑0.33↓1.2 years↓
"When this card is put into a graveyard from the battlefield, return it to its owner's hand."
Kudzu82%
$1.76↑#256950.79↑33.1 years↑
"When enchanted land becomes tapped, destroy it. That land's controller may attach this Aura to a land of their choice."
+1 more matching line
Rancor82%
$0.97↑#829↑0.26↓27.6 years
"When this Aura is put into a graveyard from the battlefield, return it to its owner's hand."
Spine of Ish Sah82%
$0.26↑#2558↑0.39↓15.6 years↓
"When this artifact is put into a graveyard from the battlefield, return it to its owner's hand."
Despondency80%
$0.11↓#200890.19↓27.9 years
"When this Aura is put into a graveyard from the battlefield, return it to its owner's hand."
Cessation80%
$0.15↓#220990.5827.6 years
"When this Aura is put into a graveyard from the battlefield, return it to its owner's hand."
Fiery Mantle80%
$0.19↓#200760.35↓27.9 years
"When this Aura is put into a graveyard from the battlefield, return it to its owner's hand."
Orcish Mine79%
$0.19↓#30376↓0.33↓30.9 years↑
"Enchant land"
+1 more matching line
Sleeper's Guile79%
$0.13↓#203210.86↑27.6 years
"When this Aura is put into a graveyard from the battlefield, return it to its owner's hand."
Steam Vines78%
$0.20↓#270190.79↑24.9 years↓
"When enchanted land becomes tapped, destroy it and this Aura deals 1 damage to that land's controller. That player attaches this Aura to a land of their choice."
+1 more matching line
Mine Layer78%
$3.18↑#189311.00↑24.9 years↓
"Whenever a land with a mine counter on it becomes tapped, destroy it."
Sluggishness78%
$0.16↓#208280.6027.6 years
"When this Aura is put into a graveyard from the battlefield, return it to its owner's hand."
Pooling Venom78%
$0.36↑#265880.29↓19.3 years↓
"Enchant land"
+1 more matching line
Zodiac Dragon78%
$544.00↑#258910.29↓27.3 years
"When this creature is put into your graveyard from the battlefield, you may return it to your hand."
Draconic Destiny78%
$0.41↑#11392↑0.29↓3.8 years↓
"When enchanted creature dies, return this card to its owner's hand."