Karn, Scion of Urza 
Legendary Planeswalker — Karn
$3.83 #5481 0.43 8.4 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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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 Engineer89%
$0.57↓#48710.16↓5.4 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 Artificer87%
$0.70↓#48220.69↑3.8 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 Synthesizer83%
$16.44↑#1724↑0.75↑2.4 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%
$0.25↓#9587↓0.12↓3.8 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%
$35.28↑#118↑1.25↑5.3 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.'""
Oviya Pashiri, Sage Lifecrafter72%
$0.21↓#14341↓0.449.9 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."
Urza, Lord High Artificer72%
$14.88↑#806↑2.31↑7.2 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.""
Thousand Moons Smithy // Barracks of the Thousand72%
$3.36↓#2043↑0.17↓2.8 years↓
"Whenever you cast an artifact or creature spell using mana produced by Barracks of the Thousand, 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's Factory71%
$0.30↓#44700.13↓19.9 years↑
"
, : Create a 2/2 colorless Assembly-Worker artifact creature token."
, : Create a 2/2 colorless Assembly-Worker artifact creature token."
Envoy of Okinec Ahau71%
$0.10↓#23309↓0.00↓2.8 years↓
"
: Create a 1/1 colorless Gnome artifact creature token."
: Create a 1/1 colorless Gnome artifact creature token."
Metrognome70%
$0.45↓#28684↓0.29↓27.9 years↑
", : Create a 1/1 colorless Gnome artifact creature token."
, : Create a 1/1 colorless Gnome artifact creature token."
Browse70%
$0.19↓#30284↓0.29↓30.2 years↑
"
: Look at the top five cards of your library, put one of them into your hand, and exile the rest."
: Look at the top five cards of your library, put one of them into your hand, and exile the rest."
Doomed Artisan70%
$0.37↓#17514↓0.30↓7.0 years↓
"At the beginning of your end step, create a colorless Sculpture artifact creature token with "This token's power and toughness are each equal to the number of Sculptures you control.""