Herald of the Dreadhorde 

Creature — Zombie Warrior
$0.09 #19069 0.06 7.5 years
When this creature dies, amass Zombies 2. (Put two +1/+1 counters on an Army you control. It's also a Zombie. If you don't control an Army, create a 0/0 black Zombie Army creature token first.)
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Cards similar to Herald of the Dreadhorde 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.
Rhovanion Rampager77%
$0.28↑#14462↑0.110.2 years↓
"When this creature dies, amass Goblins X, where X is this creature's power."
Bleeding Edge76%
$0.20↑#189510.007.5 years
"Up to one target creature gets -2/-2 until end of turn. Amass Zombies 2."
Commence the Endgame75%
$0.24↑#8453↑0.157.5 years
"Draw two cards, then amass Zombies X, where X is the number of cards in your hand."
Spinal Centipede75%
$0.18↑#24085↓0.008.0 years
"When this creature dies, put a +1/+1 counter on target creature you control."
Steadfast Sentry75%
$0.04↓#27753↓0.007.3 years
"When this creature dies, put a +1/+1 counter on target creature you control."