Mana Vortex 
Enchantment
$14.10 #20645 1.92 32.2 years
When you cast this spell, counter it unless you sacrifice a land.
At the beginning of each player's upkeep, that player sacrifices a land of their choice.
When there are no lands on the battlefield, sacrifice this enchantment.
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Cards similar to Mana Vortex 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.
Destructive Flow92%
$1.47↓#204661.69↓25.7 years↓
"At the beginning of each player's upkeep, that player sacrifices a nonbasic land of their choice."
Stoneshaker Shaman90%
$0.60↓#11016↑1.04↓21.0 years↓
"At the beginning of each player's end step, that player sacrifices an untapped land of their choice."
Braids, Cabal Minion86%
$1.11↓#4722↑2.15↑25.1 years↓
"At the beginning of each player's upkeep, that player sacrifices an artifact, creature, or land of their choice."
Keldon Firebombers82%
$2.09↓#174511.71↓26.4 years↓
"When this creature enters, each player sacrifices all lands they control except for three."
Global Ruin80%
$0.38↓#223902.11↑26.0 years↓
"Each player chooses from the lands they control a land of each basic land type, then sacrifices the rest."
Tectonic Break80%
$9.59↓#166442.17↑27.0 years↓
"Each player sacrifices X lands of their choice."
Molder Slug79%
$0.34↓#193480.43↓23.0 years↓
"At the beginning of each player's upkeep, that player sacrifices an artifact of their choice."
Tremble78%
$0.19↓#196010.55↓25.1 years↓
"Each player sacrifices a land of their choice."
Razing Snidd78%
$0.11↓#32137↓0.18↓25.7 years↓
"When this creature enters, each player sacrifices a land of their choice."
Serendib Djinn77%
$151.56↑#28315↓0.00↓32.8 years
"When you control no lands, sacrifice this creature."
+1 more matching line
Drop of Honey77%
$543.18↑#244310.39↓32.8 years
"When there are no creatures on the battlefield, sacrifice this enchantment."
Porphyry Nodes76%
$0.32↓#218090.50↓19.7 years↓
"When there are no creatures on the battlefield, sacrifice this enchantment."
Wildfire76%
$0.85↓#12886↑1.56↓28.3 years↓
"Each player sacrifices four lands of their choice. this card deals 4 damage to each creature."
Yawning Fissure76%
$0.05↓#29316↓1.07↓17.3 years↓
"Each opponent sacrifices a land of their choice."
Woebringer Demon76%
$0.26↓#219340.44↓21.0 years↓
"At the beginning of each player's upkeep, that player sacrifices a creature of their choice. If the player can't, sacrifice this creature."
Smokestack76%
$1.09↓#8634↑2.22↑28.0 years↓
"At the beginning of each player's upkeep, that player sacrifices a permanent of their choice for each soot counter on this artifact."
Burning Sands76%
$2.42↓#189651.70↓25.1 years↓
"Whenever a creature dies, that creature's controller sacrifices a land of their choice."
Kuon, Ogre Ascendant // Kuon's Essence74%
$1.00↓#228860.47↓21.4 years↓
"At the beginning of each player's upkeep, that player sacrifices a creature of their choice."
Tainted Aether74%
$8.33↓#13188↑1.77↓28.0 years↓
"Whenever a creature enters, its controller sacrifices a creature or land of their choice."
Pillar Tombs of Aku74%
$1.02↓#29912↓0.47↓29.7 years↓
"At the beginning of each player's upkeep, that player may sacrifice a creature of their choice. If that player doesn't, they lose 5 life and you sacrifice this enchantment."