Corsairs of Umbar 

Creature — Human Pirate
$0.27 #6056 0.07 3.2 years
Whenever this creature deals combat damage to a player, amass Orcs 3. (Put three +1/+1 counters on an Army you control. It's also an Orc. If you don't control an Army, create a 0/0 black Orc Army creature token first.)
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Cards similar to Corsairs of Umbar 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.
Warg Rider89%
$30.56↑#64310.002.8 years
"At the beginning of combat on your turn, amass Orcs 2."
+1 more matching line
Fall of Cair Andros78%
$0.38↑#69520.22↑3.2 years
"Whenever a creature an opponent controls is dealt excess noncombat damage, amass Orcs X, where X is that excess damage."
March from the Black Gate75%
$0.27#53940.24↑3.2 years
"When this enchantment enters and whenever an Army you control attacks, amass Orcs 1."
Warbeast of Gorgoroth74%
$0.18↓#14482↓0.27↑3.2 years
"Whenever this creature or another creature you control with power 4 or greater dies, amass Orcs 2."
The Great Goblin74%
$0.71↑#11490↓0.000.1 years↓
"Whenever you put one or more counters on a Goblin, Orc, or Army you control, this card deals 2 damage to target opponent."
Mauhúr, Uruk-hai Captain73%
$0.31↑#4620↑0.25↑3.2 years
"If one or more +1/+1 counters would be put on an Army, Goblin, or Orc you control, that many plus one +1/+1 counters are put on it instead."
Along the Crooked Way73%
$0.31↑#16493↓0.000.1 years↓
"
: Goblins and Orcs you control gain menace until end of turn."
+1 more matching line
Assault on Osgiliath72%
$2.37↑#8229↓0.50↑3.2 years
"Amass Orcs X, then Goblins and Orcs you control gain double strike and haste until end of turn."