Ixidron 
Creature — Illusion
$0.41 #8048 0.94 20.0 years
As this creature enters, turn all other nontoken creatures face down. (They're 2/2 creatures.)
Ixidron's power and toughness are each equal to the number of face-down creatures on the battlefield.
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Cards similar to Ixidron 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.
Primal Whisperer80%
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"This creature gets +2/+2 for each face-down creature on the battlefield."
Beast of Burden76%
$0.48↑#17994↓0.33↓27.7 years↑
"this card's power and toughness are each equal to the number of creatures on the battlefield."
Scion of the Wild74%
$0.23↓#23871↓0.06↓21.0 years
"this card's power and toughness are each equal to the number of creatures you control."
Burrowguard Mentor74%
$0.29↓#67250.00↓2.2 years↓
"this card's power and toughness are each equal to the number of creatures you control."
Crusader of Odric74%
$0.16↓#12378↓0.32↓14.3 years↓
"this card's power and toughness are each equal to the number of creatures you control."
Rusting Golem74%
$0.24↓#31047↓0.07↓26.7 years↑
"this card's power and toughness are each equal to the number of fade counters on it."
Battle Squadron74%
$0.22↓#10403↓0.27↓27.0 years↑
"this card's power and toughness are each equal to the number of creatures you control."
Illithid Harvester // Plant Tadpoles74%
$0.38↓#71990.38↓4.4 years↓
"When this creature enters, turn any number of target tapped nontoken creatures face down. They're 2/2 Horror creatures."
Matca Rioters74%
$0.08↓#29330↓0.30↓17.7 years↓
"this card's power and toughness are each equal to the number of basic land types among lands you control."
Geist-Honored Monk73%
$0.29↓#87270.07↓15.1 years↓
"this card's power and toughness are each equal to the number of creatures you control."
Cyber Conversion73%
$3.88↑#4991↑0.19↓3.0 years↓
"Turn target creature face down. It's a 2/2 Cyberman artifact creature."
Hanweir Militia Captain // Westvale Cult Leader72%
$0.38↓#89370.05↓10.5 years↓
"this card's power and toughness are each equal to the number of creatures you control."
Kagemaro, First to Suffer72%
$2.97↑#18341↓0.28↓21.4 years↑
"this card's power and toughness are each equal to the number of cards in your hand."
Masumaro, First to Live72%
$0.82↑#21194↓0.14↓21.4 years↑
"this card's power and toughness are each equal to twice the number of cards in your hand."
Territorial Maro72%
$0.06↓#24501↓0.00↓4.1 years↓
"this card's power and toughness are each equal to twice the number of basic land types among lands you control."
Silverwing Squadron72%
$0.35↓#5156↑0.05↓7.0 years↓
"this card's power and toughness are each equal to the number of creatures you control."
Plague Rats72%
$0.17↓#26644↓0.20↓33.2 years↑
"this card's power and toughness are each equal to the number of creatures named this card on the battlefield."
Altar Golem71%
$0.45↑#20415↓0.00↓18.2 years↓
"this card's power and toughness are each equal to the number of creatures on the battlefield."
Molimo, Maro-Sorcerer71%
$0.23↓#12110↓0.07↓26.0 years↑
"this card's power and toughness are each equal to the number of lands you control."
Mirkwood Pathmaker71%
$0.16↓#15114↓0.17↓0.2 years↓
"this card's power and toughness are each equal to the number of lands you control."