Battle Strain 
Enchantment
$0.31 #21399 0.31 25.1 years
Whenever a creature blocks, this enchantment deals 1 damage to that creature's controller.
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Cards similar to Battle Strain 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.
Heat of Battle96%
$0.29↓#231660.4028.6 years↑
"Whenever a creature blocks, this enchantment deals 1 damage to that creature's controller."
Acolyte of the Inferno86%
$0.01↓#27533↓0.06↓11.3 years↓
"Whenever this creature becomes blocked by a creature, it deals 2 damage to that creature."
Kolaghan Aspirant86%
$0.16↓#30018↓0.00↓11.6 years↓
"Whenever this creature becomes blocked by a creature, this creature deals 1 damage to that creature."
Battle-Scarred Goblin85%
$0.17↓#16730↑0.06↓3.3 years↓
"Whenever this creature becomes blocked, it deals 1 damage to each creature blocking it."
Tetsuko Umezawa, Pursuer84%
$0.15↓#27110↓0.01↓0.0 years↓
"Whenever a creature an opponent controls with power or toughness 1 or less blocks, this card deals 1 damage to that creature's controller."
Goblin Javelineer84%
$0.18↓#14763↑0.21↓5.2 years↓
"Whenever this creature becomes blocked, it deals 1 damage to target creature blocking it."
Ashmouth Hound83%
$0.05↓#230930.00↓15.1 years↓
"Whenever this creature blocks or becomes blocked by a creature, this creature deals 1 damage to that creature."
Ornery Goblin83%
$0.10↓#224140.10↓8.0 years↓
"Whenever this creature blocks or becomes blocked by a creature, this creature deals 1 damage to that creature."
Tormentor's Helm82%
$0.22↓#177940.20↓5.7 years↓
"Whenever equipped creature becomes blocked, it deals 1 damage to defending player."
Goblin Swine-Rider82%
$0.20↓#29106↓0.2229.7 years↑
"Whenever this creature becomes blocked, it deals 2 damage to each attacking creature and each blocking creature."
Somberwald Vigilante82%
$0.04↓#28964↓0.05↓14.5 years↓
"Whenever this creature becomes blocked by a creature, this creature deals 1 damage to that creature."
Carnage Gladiator82%
$0.05↓#205120.06↓13.5 years↓
"Whenever a creature blocks, that creature's controller loses 1 life."
Powerstone Minefield81%
$0.40↑#195590.59↑25.4 years
"Whenever a creature attacks or blocks, this enchantment deals 2 damage to it."
Viashino Weaponsmith80%
$0.17↓#31614↓0.00↓28.0 years↑
"Whenever this creature becomes blocked by a creature, this creature gets +2/+2 until end of turn."
Sawtooth Ogre80%
$0.06↓#32050↓0.2529.4 years↑
"Whenever this creature blocks or becomes blocked by a creature, this creature deals 1 damage to that creature at end of combat."
Alley Grifters80%
$0.12↓#26470↓0.2527.0 years↑
"Whenever this creature becomes blocked, defending player discards a card."
Slate Street Ruffian80%
$0.05↓#26438↓0.14↓13.7 years↓
"Whenever this creature becomes blocked, defending player discards a card."
Skewer Slinger79%
$0.18↓#201960.00↓3.1 years↓
"Whenever this creature blocks or becomes blocked by a creature, this creature deals 1 damage to that creature."
Mage Hunters' Onslaught79%
$0.16↓#239710.00↓5.5 years↓
"Whenever a creature blocks this turn, its controller loses 1 life."
Flint Golem79%
$0.08↓#28776↓0.00↓26.7 years↑
"Whenever this creature becomes blocked, defending player mills three cards."