Agent of the Shadow Thieves 

Legendary Enchantment — Background
$0.27 #5398 0.33 4.2 years
Commander creatures you own have "Whenever this creature attacks a player, if no opponent has more life than that player, put a +1/+1 counter on this creature. It gains deathtouch and indestructible until end of turn."
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Cards similar to Agent of the Shadow Thieves 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.
Sword Coast Sailor88%
$0.18↓#58800.00↓4.2 years
"Commander creatures you own have "Whenever this creature attacks a player, if no opponent has more life than that player, this creature can't be blocked this turn.""
Veteran Soldier86%
$0.23↓#11802↓0.11↓4.2 years
"Commander creatures you own have "Whenever this creature attacks a player, if no opponent has more life than that player, for each opponent, create a 1/1 white Soldier creature token that's tapped and attacking that opponent.""
Guild Artisan84%
$0.26↓#3593↑0.12↓4.2 years
"Commander creatures you own have "Whenever this creature attacks a player, if no opponent has more life than that player, you create two Treasure tokens.""
Hardy Outlander83%
$0.16↓#14727↓0.75↑4.2 years
"Commander creatures you own have "Whenever this creature attacks a player, if no opponent has more life than that player, another target creature you control gets +X/+X until end of turn, where X is this creature's power.""
Keleth, Sunmane Familiar80%
$0.21↓#6749↓0.00↓5.8 years↑
"Whenever a commander you control attacks, put a +1/+1 counter on it."
Flaming Fist74%
$0.30↑#49880.294.2 years
"Commander creatures you own have "Whenever this creature attacks, it gains double strike until end of turn.""
Falthis, Shadowcat Familiar73%
$0.32↑#7008↓0.295.8 years↑
"Commanders you control have menace and deathtouch."