Karn, Scion of Urza 
Legendary Planeswalker — Karn
$4.32 #5472 0.24 8.5 years
+1: Reveal the top two cards of your library. An opponent chooses one of them. Put that card into your hand and exile the other with a silver counter on it.
−1: Put a card you own with a silver counter on it from exile into your hand.
−2: Create a 0/0 colorless Construct artifact creature token with "This token gets +1/+1 for each artifact you control."
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Cards similar to Karn, Scion of Urza 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.
Digsite Engineer87%
$0.72↓#50000.155.5 years↓
"Whenever you cast an artifact spell, you may pay 
. If you do, create a 0/0 colorless Construct artifact creature token with "This token gets +1/+1 for each artifact you control.""
. If you do, create a 0/0 colorless Construct artifact creature token with "This token gets +1/+1 for each artifact you control.""
Urza, Chief Artificer85%
$1.06↓#49230.293.9 years↓
"At the beginning of your end step, create a 0/0 colorless Construct artifact creature token with "This token gets +1/+1 for each artifact you control.""
Simulacrum Synthesizer81%
$17.20↑#1662↑0.84↑2.5 years↓
"Whenever another artifact you control with mana value 3 or greater enters, create a 0/0 colorless Construct artifact creature token with "This token gets +1/+1 for each artifact you control.""
Urza's Command76%
$0.27↓#9766↓0.12↓3.9 years↓
"• Create a tapped 0/0 colorless Construct artifact creature token with "This token gets +1/+1 for each artifact you control.""
Urza's Saga76%
$34.45↑#117↑1.23↑5.5 years↓
"This Saga gains ", 
: Create a 0/0 colorless Construct artifact creature token with 'This token gets +1/+1 for each artifact you control.'""
, : Create a 0/0 colorless Construct artifact creature token with 'This token gets +1/+1 for each artifact you control.'""
Thousand Moons Smithy // Barracks of the Thousand72%
$2.80↓#2088↑0.192.9 years↓
"Whenever you cast an artifact or creature spell using mana produced by this card, create a white Gnome Soldier artifact creature token with "This token's power and toughness are each equal to the number of artifacts and/or creatures you control.""
Urza, Lord High Artificer70%
$15.42↑#801↑2.23↑7.4 years↓
"When this card enters, create a 0/0 colorless Construct artifact creature token with "This token gets +1/+1 for each artifact you control.""
Oviya Pashiri, Sage Lifecrafter70%
$0.21↓#14630↓0.1410.1 years↑
"
, : Create an X/X colorless Construct artifact creature token, where X is the number of creatures you control."
, : Create an X/X colorless Construct artifact creature token, where X is the number of creatures you control."
Envoy of Okinec Ahau70%
$0.09↓#23826↓0.00↓2.9 years↓
"
: Create a 1/1 colorless Gnome artifact creature token."
: Create a 1/1 colorless Gnome artifact creature token."