Sphere of Annihilation 
Artifact
$0.21 #20438 0.50 5.1 years
This artifact enters with X void counters on it.
At the beginning of your upkeep, exile this artifact, all creatures and planeswalkers with mana value less than or equal to the number of void counters on it, and all creature and planeswalker cards in graveyards with mana value less than or equal to the number of void counters on it.
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Cards similar to Sphere of Annihilation 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.
Shadows' Verdict83%
$0.21#229050.24↓5.9 years
"Exile all creatures and planeswalkers with mana value 3 or less from the battlefield and all creature and planeswalker cards with mana value 3 or less from all graveyards."
Calamity of the Titans70%
$4.14↑#4612↑0.88↑3.1 years↓
"Exile each creature and planeswalker with mana value less than the revealed card's mana value."