Misty Mountains Raider 

Creature — Goblin Soldier
$0.22 #13594 0.06 0.2 years
Whenever you attack, amass Goblins 2. (Put two +1/+1 counters on an Army you control. It's also a Goblin. If you don't control an Army, create a 0/0 black Goblin Army creature token first.)
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Cards similar to Misty Mountains Raider 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.
March from the Black Gate90%
$0.27↑#5218↑0.003.3 years↑
"When this enchantment enters and whenever an Army you control attacks, amass Orcs 1."
Great Goblin, Foul-Hearted86%
$17.13↑#161430.36↑0.2 years
"Whenever this card enters or attacks, amass Goblins 3."
Bothersome Noisemaker80%
$0.26↑#9956↑0.150.2 years
"Whenever you cast a noncreature spell, amass Goblins 1."
Shagrat, Loot Bearer76%
$0.29↑#157410.22↑3.3 years↑
"Whenever this card attacks, attach up to one target Equipment to it. Then amass Orcs X, where X is the number of Equipment attached to this card."
Warbeast of Gorgoroth75%
$0.19↓#146130.003.3 years↑
"Whenever this creature or another creature you control with power 4 or greater dies, amass Orcs 2."
Along the Crooked Way73%
$0.25↑#136900.140.2 years
"Whenever a creature card leaves your graveyard, amass Goblins 1."
Goblin Plate Mail73%
$0.14↓#156960.030.2 years
"When this Equipment enters, amass Goblins 1, then attach this Equipment to the amassed Army."