Thresher Beast 
Creature — Beast
$0.15 #26429 0.38 26.3 years
Whenever this creature becomes blocked, defending player sacrifices a land of their choice.
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Cards similar to Thresher Beast 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.
Tide of War83%
$1.56↑#14153↑1.10↑21.9 years↓
"Whenever one or more creatures block, flip a coin. If you win the flip, each blocking creature is sacrificed by its controller. If you lose the flip, each blocked creature is sacrificed by its controller."
Lava Runner82%
$0.49↑#273890.4026.9 years
"Whenever this creature becomes the target of a spell or ability, that spell or ability's controller sacrifices a land of their choice."
Destructive Urge82%
$0.54↑#17661↑1.03↑27.9 years↑
"Whenever enchanted creature deals combat damage to a player, that player sacrifices a land of their choice."
Labyrinth Raptor80%
$0.33↑#12348↑0.13↓6.4 years↓
"Whenever a creature you control with menace becomes blocked, defending player sacrifices a creature of their choice that's blocking it."
Plague Wight80%
$0.08↓#280690.00↓7.6 years↓
"Whenever this creature becomes blocked, each creature blocking it gets -1/-1 until end of turn."
Yawning Fissure79%
$0.02↓#290700.73↑17.1 years↓
"Each opponent sacrifices a land of their choice."
Burning Sands76%
$2.40↑#18596↑1.66↑24.9 years↓
"Whenever a creature dies, that creature's controller sacrifices a land of their choice."
Tectonic Hellion76%
$0.19↑#20998↑0.00↓7.0 years↓
"Whenever this creature attacks, each player who controls the most lands sacrifices two lands of their choice."
Sylvan Basilisk75%
$0.33↑#248150.27↓28.2 years↑
"Whenever this creature becomes blocked by a creature, destroy that creature."
Battle Strain75%
$0.30↑#21064↑0.19↓24.9 years↓
"Whenever a creature blocks, this enchantment deals 1 damage to that creature's controller."
Grasping Giant75%
$0.60↑#20072↑0.10↓6.6 years↓
"Whenever this creature becomes blocked by a creature, exile that creature until this creature leaves the battlefield."
Evil Eye of Urborg74%
$0.26↑#12026↑0.4819.9 years↓
"Whenever this creature becomes blocked by a creature, destroy that creature."
Slate Street Ruffian74%
$0.07↓#261610.10↓13.6 years↓
"Whenever this creature becomes blocked, defending player discards a card."
Alley Grifters74%
$0.12↓#262520.09↓26.9 years
"Whenever this creature becomes blocked, defending player discards a card."
Viashino Weaponsmith74%
$0.15#313140.00↓27.9 years↑
"Whenever this creature becomes blocked by a creature, this creature gets +2/+2 until end of turn."
Goblin Javelineer73%
$0.14↓#14515↑0.21↓5.1 years↓
"Whenever this creature becomes blocked, it deals 1 damage to target creature blocking it."
Earthlink73%
$0.91↑#295500.86↑31.3 years↑
"Whenever a creature dies, that creature's controller sacrifices a land of their choice."
Battle-Scarred Goblin73%
$0.16↑#16428↑0.22↓3.2 years↓
"Whenever this creature becomes blocked, it deals 1 damage to each creature blocking it."
Sacred Prey73%
$0.20↑#292860.22↓26.9 years
"Whenever this creature becomes blocked, you gain 1 life."
Deeproot Warrior73%
$0.09↓#280490.00↓8.9 years↓
"Whenever this creature becomes blocked, it gets +1/+1 until end of turn."