The Mightstone and Weakstone 
Legendary Artifact — Powerstone
$4.26 #3056 0.11 3.9 years
When The Mightstone and Weakstone enters, choose one —
• Draw two cards.
• Target creature gets -5/-5 until end of turn.
: Add 
. This mana can't be spent to cast nonartifact spells.(Melds with Urza, Lord Protector.)
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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.
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": Add ."
: Add ."
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+1 more matching line
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"Target creature gets -4/-4 until end of turn."
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