Herald of the Dreadhorde 

Creature — Zombie Warrior
$0.05 #18946 0.29 7.3 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.
Bleeding Edge76%
$0.14↑#189480.257.3 years
"Up to one target creature gets -2/-2 until end of turn. Amass Zombies 2."
Commence the Endgame75%
$0.27↑#8387↑0.337.3 years
"Draw two cards, then amass Zombies X, where X is the number of cards in your hand."
Goblin Assault Team75%
$0.10↑#209000.47↑7.3 years
"When this creature dies, put a +1/+1 counter on target creature you control."
Sparring Construct75%
$0.16↑#176590.00↓8.4 years↑
"When this creature dies, put a +1/+1 counter on target creature you control."
Guul Draz Mucklord75%
$0.06↑#25972↓0.57↑5.9 years↓
"When this creature dies, put a +1/+1 counter on target creature you control."