Mirrodin Besieged 
Enchantment
$3.89 #2473 0.42 7.4 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%
$0.13↓#7998↓0.25↓16.1 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%
$0.49↓#26080.14↓9.7 years↑
"Whenever you cast an artifact spell, create a 1/1 colorless Thopter artifact creature token with flying."
Ravenous Robots76%
$1.47↓#7135↓0.350.6 years↓
"Whenever you cast an artifact spell, create a 1/1 colorless Robot artifact creature token."
Sai, Master Thopterist70%
$0.35↓#814↑0.22↓8.3 years
"Whenever you cast an artifact spell, create a 1/1 colorless Thopter artifact creature token with flying."