Mirrodin Besieged 
Enchantment
$4.32 #2440 0.38 7.2 years
As this enchantment enters, choose Mirran or Phyrexian.
• Mirran — Whenever you cast an artifact spell, create a 1/1 colorless Myr artifact creature token.
• Phyrexian — At the beginning of your end step, draw a card, then discard a card. Then if there are fifteen or more artifact cards in your graveyard, target opponent loses the game.
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Cards similar to Mirrodin Besieged 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.
Myrsmith81%
$0.14↓#7878↓0.06↓15.9 years↑
"Whenever you cast an artifact spell, you may pay 
. If you do, create a 1/1 colorless Myr artifact creature token."
. If you do, create a 1/1 colorless Myr artifact creature token."
Efficient Construction76%
$0.45↓#26310.26↓9.6 years↑
"Whenever you cast an artifact spell, create a 1/1 colorless Thopter artifact creature token with flying."
Ravenous Robots76%
$1.45↓#7969↓0.00↓0.5 years↓
"Whenever you cast an artifact spell, create a 1/1 colorless Robot artifact creature token."
Sai, Master Thopterist72%
$0.38↓#820↑0.24↓8.1 years
"Whenever you cast an artifact spell, create a 1/1 colorless Thopter artifact creature token with flying."
Pinnacle Emissary70%
$1.55↓#5634↓0.311.1 years↓
"Whenever you cast an artifact spell, create a 1/1 colorless Drone artifact creature token with flying and "This token can block only creatures with flying.""