Flowstone Flood 
Sorcery
$0.19 #27388 0.65 28.3 years
Buyback—Pay 3 life, Discard a card at random. (You may pay 3 life and discard a card at random in addition to any other costs as you cast this spell. If you do, put this card into your hand as it resolves.)
Destroy target land.
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Cards similar to Flowstone Flood 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.
Rain of Tears87%
$0.23↑#231270.5929.5 years↑
"Destroy target land."
Volcanic Upheaval87%
$0.06↓#235090.5611.0 years↓
"Destroy target land."
Winter's Grasp87%
$2.87↑#236630.41↓29.5 years↑
"Destroy target land."
Ice Storm87%
$4.02↑#13731↑1.16↑33.2 years↑
"Destroy target land."
Craterize87%
$0.15↓#245890.6514.3 years↓
"Destroy target land."
Stone Rain87%
$0.15↓#13237↑0.91↑33.2 years↑
"Destroy target land."
Sinkhole87%
$8.20↑#19078↑0.84↑33.2 years↑
"Destroy target land."
Raze86%
$0.85↑#21374↑0.6128.0 years
"Destroy target land."
Bitter Triumph83%
$0.32↑#828↑0.21↓2.9 years↓
"As an additional cost to cast this spell, discard a card or pay 3 life."
+1 more matching line
Acceptable Losses83%
$0.09↓#292820.00↓25.1 years↓
"As an additional cost to cast this spell, discard a card at random."
Earth Rift83%
$0.20↑#251490.6325.1 years↓
"Destroy target land."
Implode83%
$0.26↑#241560.36↓25.7 years↓
"Destroy target land."
Lava Flow83%
$0.30↑#298830.21↓29.5 years↑
"Destroy target creature or land."
Wrecking Ball83%
$0.09↓#20493↑0.6820.5 years↓
"Destroy target creature or land."
Survey the Wreckage83%
$0.20↑#242500.29↓14.0 years↓
"Destroy target land. Create a 1/1 red Goblin creature token."
Seismic Mage83%
$0.60↑#293431.05↑27.0 years↓
"
, 
, Discard a card: Destroy target land."
, , Discard a card: Destroy target land."
Lay Waste82%
$0.13↓#238220.7528.0 years
"Destroy target land."
+1 more matching line
Ogre Arsonist81%
$0.13↓#298790.5728.3 years
"When this creature enters, destroy target land."
Ravaging Horde81%
$18.96↑#306990.33↓27.5 years
"When this creature enters, destroy target land."
Goblin Settler81%
$0.28↑#20367↑0.50↓27.3 years↓
"When this creature enters, destroy target land."