Phyrexian Devourer 
Artifact Creature — Phyrexian Construct
$36.45 #14929 0.30 30.2 years
When this creature's power is 7 or greater, sacrifice it.
Exile the top card of your library: Put X +1/+1 counters on this creature, where X is the exiled card's mana value.
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Cards similar to Phyrexian Devourer 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.
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"When you cast this spell, each player reveals the top card of their library. This creature enters with X +1/+1 counters on it, where X is the total mana value of all cards revealed this way."
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"When you control a creature with toughness 2 or less, sacrifice this creature."
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"
: Scry 1, then reveal the top card of your library. This creature gets +X/+0 until end of turn, where X is that card's mana value."
: Scry 1, then reveal the top card of your library. This creature gets +X/+0 until end of turn, where X is that card's mana value."
Heed the Mists70%
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"Mill a card, then draw cards equal to the milled card's mana value."