Mana Vortex 
Enchantment
$14.43 #20380 1.58 32.1 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%
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"At the beginning of each player's upkeep, that player sacrifices a nonbasic land of their choice."
Stoneshaker Shaman90%
$0.66↓#10747↑1.00↓20.9 years↓
"At the beginning of each player's end step, that player sacrifices an untapped land of their choice."
Braids, Cabal Minion86%
$1.20↓#4924↑2.21↑24.9 years↓
"At the beginning of each player's upkeep, that player sacrifices an artifact, creature, or land of their choice."
Keldon Firebombers82%
$2.06↓#170171.6126.3 years↓
"When this creature enters, each player sacrifices all lands they control except for three."
Global Ruin80%
$0.38↓#221011.84↑25.9 years↓
"Each player chooses from the lands they control a land of each basic land type, then sacrifices the rest."
Tectonic Break80%
$9.37↓#163342.05↑26.9 years↓
"Each player sacrifices X lands of their choice."
Molder Slug79%
$0.33↓#191650.53↓22.9 years↓
"At the beginning of each player's upkeep, that player sacrifices an artifact of their choice."
Tremble78%
$0.20↓#191450.47↓24.9 years↓
"Each player sacrifices a land of their choice."
Razing Snidd78%
$0.13↓#31853↓0.50↓25.6 years↓
"When this creature enters, each player sacrifices a land of their choice."
Serendib Djinn77%
$151.56↑#28023↓0.44↓32.7 years
"When you control no lands, sacrifice this creature."
+1 more matching line
Drop of Honey77%
$486.65↑#242740.45↓32.7 years
"When there are no creatures on the battlefield, sacrifice this enchantment."
Porphyry Nodes76%
$0.28↓#215530.58↓19.6 years↓
"When there are no creatures on the battlefield, sacrifice this enchantment."
Wildfire76%
$0.80↓#12649↑1.38↓28.2 years↓
"Each player sacrifices four lands of their choice. this card deals 4 damage to each creature."
Yawning Fissure76%
$0.02↓#29070↓0.73↓17.1 years↓
"Each opponent sacrifices a land of their choice."
Smokestack76%
$1.04↓#8537↑2.08↑27.9 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%
$2.40↓#185961.6624.9 years↓
"Whenever a creature dies, that creature's controller sacrifices a land of their choice."
Raze74%
$0.82↓#211440.56↓27.9 years↓
"As an additional cost to cast this spell, sacrifice a land."
Kuon, Ogre Ascendant // Kuon's Essence74%
$1.13↓#225110.78↓21.3 years↓
"At the beginning of each player's upkeep, that player sacrifices a creature of their choice."
Tainted Aether74%
$8.29↓#12995↑1.6227.9 years↓
"Whenever a creature enters, its controller sacrifices a creature or land of their choice."
Pillar Tombs of Aku74%
$1.04↓#29646↓0.12↓29.6 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."