Dwindle 

Enchantment — Aura
$0.04 #27502 0.00 8.3 years
Enchant creature
Enchanted creature gets -6/-0.
When enchanted creature blocks, destroy it. (The attacking creature remains blocked.)
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Cards similar to Dwindle 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.
Sylvan Basilisk84%
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"Whenever this creature becomes blocked by a creature, destroy that creature."
Evil Eye of Urborg84%
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"Whenever this creature becomes blocked by a creature, destroy that creature."
Sensory Deprivation82%
$0.06↑#288560.0015.1 years↑
"Enchanted creature gets -3/-0."
+1 more matching line
Fresh Start81%
$0.29↑#12742↑0.68↑1.5 years↓
"Enchanted creature gets -5/-0 and loses all abilities."
+1 more matching line
Mystic Subdual81%
$0.09↑#16416↑0.24↑6.5 years↓
"Enchanted creature gets -2/-0 and loses all abilities."
Rust Scarab81%
$0.19↑#21224↑0.0713.7 years↑
"Whenever this creature becomes blocked, you may destroy target artifact or enchantment defending player controls."
Cast into Darkness80%
$0.11↑#232420.0612.5 years↑
"Enchanted creature gets -2/-0 and can't block."
+1 more matching line
Treefolk Mystic80%
$0.20↑#278600.20↑27.7 years↑
"Whenever this creature blocks or becomes blocked by a creature, destroy all Auras attached to that creature."