Coral Net 
Enchantment — Aura
$0.22 #29319 0.47 24.6 years
Enchant green or white creature
Enchanted creature has "At the beginning of your upkeep, sacrifice this creature unless you discard a card."
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Cards similar to Coral Net 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.
Inevitable End82%
$0.17↓#19406↑0.62↑6.6 years↓
"Enchanted creature has "At the beginning of your upkeep, sacrifice a creature.""
Deathmark76%
$0.11↓#19458↑0.20↓20.1 years↓
"Destroy target green or white creature."
Wurmweaver Coil75%
$0.21↓#20473↑0.5020.6 years↓
"Enchant green creature"
Withercrown74%
$0.18↓#18890↑0.29↓5.6 years↓
"Enchanted creature has base power 0 and has "At the beginning of your upkeep, you lose 1 life unless you sacrifice this creature.""
+1 more matching line
Gloomlance74%
$0.09↓#308860.07↓18.3 years↓
"Destroy target creature. If that creature was green or white, its controller discards a card."
Pendrell Flux74%
$0.13↓#268870.36↓27.9 years↑
"Enchanted creature has "At the beginning of your upkeep, sacrifice this creature unless you pay its mana cost.""
+1 more matching line
Mind Harness74%
$0.33↑#20160↑0.60↑29.9 years↑
"Enchant red or green creature"
Instill Furor72%
$0.04↓#297550.07↓20.9 years↓
"Enchanted creature has "At the beginning of your end step, sacrifice this creature unless it attacked this turn.""
Self-Inflicted Wound72%
$0.07↓#303570.20↓11.4 years↓
"Target opponent sacrifices a green or white creature of their choice. If that player does, they lose 2 life."
Decomposition72%
$0.13↓#305190.5529.9 years↑
"Enchanted creature has "Cumulative upkeep—Pay 1 life.""
Green Scarab72%
$0.28↑#257980.00↓31.3 years↑
"Enchanted creature can't be blocked by green creatures."
+1 more matching line
Controlled Instincts70%
$0.07↓#304290.61↑17.6 years↓
"Enchant red or green creature"
White Scarab70%
$0.24↑#248960.4231.3 years↑
"Enchanted creature can't be blocked by white creatures."
Glistening Deluge70%
$0.16↓#21082↑0.33↓3.4 years↓
"All creatures get -1/-1 until end of turn. Creatures that are green and/or white get an additional -2/-2 until end of turn."
Noxious Grasp70%
$0.14↓#260580.59↑7.2 years↓
"Destroy target creature or planeswalker that's green or white. You gain 1 life."
Morgul-Knife Wound70%
$0.16↓#14214↑0.29↓3.2 years↓
"Enchanted creature gets -3/-0 and has "At the beginning of your upkeep, exile this creature unless you pay 2 life.""
Encase in Ice70%
$0.07↓#277080.00↓11.4 years↓
"Enchant red or green creature"