Flowstone Flood 
Sorcery
$0.19 #27178 0.93 28.2 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.
Sinkhole88%
$8.21↑#18797↑1.31↑33.1 years↑
"Destroy target land."
Winter's Grasp88%
$2.48↑#231570.79↓29.3 years↑
"Destroy target land."
Ice Storm88%
$4.03↑#13563↑0.27↓33.1 years↑
"Destroy target land."
Craterize88%
$0.15↓#244531.0014.1 years↓
"Destroy target land."
Stone Rain88%
$0.18↓#13108↑0.9233.1 years↑
"Destroy target land."
Rain of Tears88%
$0.24↑#228151.40↑29.3 years↑
"Destroy target land."
Volcanic Upheaval88%
$0.05↓#233390.76↓10.9 years↓
"Destroy target land."
Earth Rift85%
$0.16↓#249830.9524.9 years↓
"Destroy target land."
Implode84%
$0.22↑#240560.49↓25.6 years↓
"Destroy target land."
Wrecking Ball84%
$0.10↓#20059↑0.10↓20.3 years↓
"Destroy target creature or land."
Lava Flow84%
$0.28↑#296710.43↓29.3 years↑
"Destroy target creature or land."
Survey the Wreckage84%
$0.20↑#240150.14↓13.9 years↓
"Destroy target land. Create a 1/1 red Goblin creature token."
Seismic Mage84%
$0.62↑#291040.60↓26.9 years↓
"
, 
, Discard a card: Destroy target land."
, , Discard a card: Destroy target land."
Raze83%
$0.82↑#21144↑0.56↓27.9 years
"Destroy target land."
Lay Waste82%
$0.12↓#235360.43↓27.9 years
"Destroy target land."
+1 more matching line
Ogre Arsonist82%
$0.15↓#295450.81↓28.2 years
"When this creature enters, destroy target land."
Ravaging Horde82%
$18.77↑#303960.24↓27.3 years
"When this creature enters, destroy target land."
Goblin Settler82%
$0.26↑#20086↑0.07↓27.2 years↓
"When this creature enters, destroy target land."
Acceptable Losses82%
$0.08↓#291000.29↓24.9 years↓
"As an additional cost to cast this spell, discard a card at random."
Maw of the Mire81%
$0.09↓#263330.06↓14.9 years↓
"Destroy target land. You gain 4 life."