Thresher Beast 
Creature — Beast
$0.16 #26719 0.47 26.4 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%
$1.57↑#14253↑0.81↑22.1 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%
$0.48↑#278560.20↓27.0 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%
$0.78↑#17978↑1.13↑28.0 years↑
"Whenever enchanted creature deals combat damage to a player, that player sacrifices a land of their choice."
Labyrinth Raptor80%
$0.33↑#12590↑0.476.5 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↓#285110.13↓7.7 years↓
"Whenever this creature becomes blocked, each creature blocking it gets -1/-1 until end of turn."
Yawning Fissure79%
$0.05↓#293161.07↑17.3 years↓
"Each opponent sacrifices a land of their choice."
Burning Sands76%
$2.42↑#18965↑1.70↑25.1 years↓
"Whenever a creature dies, that creature's controller sacrifices a land of their choice."
Sylvan Basilisk75%
$0.31↑#252500.3728.3 years↑
"Whenever this creature becomes blocked by a creature, destroy that creature."
Battle Strain75%
$0.31↑#213990.31↓25.1 years↓
"Whenever a creature blocks, this enchantment deals 1 damage to that creature's controller."
Grasping Giant75%
$0.59↑#20326↑0.00↓6.7 years↓
"Whenever this creature becomes blocked by a creature, exile that creature until this creature leaves the battlefield."
Evil Eye of Urborg74%
$0.26↑#12233↑0.12↓20.0 years↓
"Whenever this creature becomes blocked by a creature, destroy that creature."
Alley Grifters74%
$0.12↓#264700.25↓27.0 years
"Whenever this creature becomes blocked, defending player discards a card."
Slate Street Ruffian74%
$0.05↓#264380.14↓13.7 years↓
"Whenever this creature becomes blocked, defending player discards a card."
Viashino Weaponsmith74%
$0.17↑#316140.00↓28.0 years↑
"Whenever this creature becomes blocked by a creature, this creature gets +2/+2 until end of turn."
Goblin Javelineer73%
$0.18↑#14763↑0.21↓5.2 years↓
"Whenever this creature becomes blocked, it deals 1 damage to target creature blocking it."
Earthlink73%
$0.96↑#298811.05↑31.4 years↑
"Whenever a creature dies, that creature's controller sacrifices a land of their choice."
Battle-Scarred Goblin73%
$0.17↑#16730↑0.06↓3.3 years↓
"Whenever this creature becomes blocked, it deals 1 damage to each creature blocking it."
Sacred Prey73%
$0.20↑#294790.00↓27.0 years
"Whenever this creature becomes blocked, you gain 1 life."
Deeproot Warrior73%
$0.10↓#284270.00↓9.1 years↓
"Whenever this creature becomes blocked, it gets +1/+1 until end of turn."
Trained Cheetah73%
$10.00↑#32082↓0.00↓27.5 years↑
"Whenever this creature becomes blocked, it gets +1/+1 until end of turn."