Satya, Aetherflux Genius {1}{U}{R}{W}
Legendary Creature — Human Artificer
Menace, haste
Whenever Satya attacks, create a tapped and attacking token that's a copy of up to one other target nontoken creature you control. You get {E}{E} (two energy counters). At the beginning of the next end step, sacrifice that token unless you pay an amount of {E} equal to its mana value.
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Cards that do something similar 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.
Loki, the Deceiver 85%
$0.52#14128
"Whenever this card attacks, create a tapped and attacking token that's a copy of another target Villain you control, except it isn't legendary and it's an Illusion in addition to its other types. Sacrifice that token at the beginning of the next end step."
Flamerush Rider 83%
$0.17#4715
"Whenever this creature attacks, create a token that's a copy of another target attacking creature and that's tapped and attacking. Exile the token at end of combat."
Shaun, Father of Synths 83%
$0.36#6550
"Whenever you attack, you may create a tapped and attacking token that's a copy of target attacking legendary creature you control other than this card, except it's not legendary and it's a Synth artifact creature in addition to its other types."
Mardu Siegebreaker 82%
$0.46#3889
"Whenever this creature attacks, for each opponent, create a tapped token that's a copy of the exiled card attacking that opponent. At the beginning of your next end step, sacrifice those tokens."
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