Invade the City 
Sorcery
$0.16 #14148 0.07 7.3 years
Amass Zombies X, where X is the number of instant and sorcery cards in your graveyard. (Put X +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 Invade the City 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.
Relentless Advance82%
$0.12↓#21273↓0.33↑7.3 years
"Amass Zombies 3."
Serpentine Curve76%
$0.13↓#18066↓0.24↑5.4 years↓
"Create a 0/0 green and blue Fractal creature token. Put X +1/+1 counters on it, where X is one plus the total number of instant and sorcery cards you own in exile and in your graveyard."
Enigma Drake73%
$0.07↓#141920.129.4 years↑
"this card's power is equal to the number of instant and sorcery cards in your graveyard."
Spellheart Chimera73%
$0.14↓#156060.0012.9 years↑
"this card's power is equal to the number of instant and sorcery cards in your graveyard."
Invading Manticore73%
$0.13↓#24237↓0.067.3 years
"When this creature enters, amass Zombies 2."
Crush Dissent72%
$0.11↓#18256↓0.94↑7.3 years
"Amass Zombies 2."
Swarming of Moria72%
$0.18↑#9393↑0.063.2 years↓
"Amass Orcs 2."
The Mouth of Sauron72%
$0.19↑#6478↑0.003.2 years↓
"When this card enters, target player mills three cards. Then amass Orcs X, where X is the number of instant and sorcery cards in that player's graveyard."
Deceive the Messenger72%
$0.15↓#140390.063.2 years↓
"Amass Orcs 1."
Saruman's Trickery72%
$0.20↑#4771↑0.33↑3.2 years↓
"Amass Orcs 1."
Book of Mazarbul72%
$0.22↑#8931↑0.053.2 years↓
"Amass Orcs 1."
Grim Initiate72%
$0.15↓#161750.29↑7.3 years
"When this creature dies, amass Zombies 1."
Runechanter's Pike71%
$0.32↑#9849↑0.31↑14.9 years↑
"Equipped creature has first strike and gets +X/+0, where X is the number of instant and sorcery cards in your graveyard."
Rise from the Tides70%
$0.11↓#7598↑0.0610.7 years↑
"Create a tapped 2/2 black Zombie creature token for each instant and sorcery card in your graveyard."
Kinetic Augur70%
$0.23↑#19114↓0.20↑6.2 years↓
"this card's power is equal to the number of instant and sorcery cards in your graveyard."
Rielle, the Everwise70%
$4.11↑#5905↑0.38↑6.4 years
"this card gets +1/+0 for each instant and sorcery card in your graveyard."