Relic Golem 
Artifact Creature — Golem
This creature can't attack or block unless an opponent has eight or more cards in their graveyard.
{2}, {T}: Target player mills two cards. (They put the top two cards of their library into their graveyard.)
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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.
Patchwork Beastie 99%
$0.25#12137
"This creature can't attack or block unless there are four or more card types among cards in your graveyard."
Grindstone 98%
#6313
"{3}, {T}: Target player mills two cards. If two cards that share a color were milled this way, repeat this process."
Tiger-Dillo 97%
$0.07#22651
"This creature can't attack or block unless you control another creature with power 4 or greater."
Flowering Lumberknot 96%
$0.05#31116
"This creature can't attack or block unless it's paired with a creature with soulbond."
Lupine Prototype 94%
$0.25#9060
"This creature can't attack or block unless a player has no cards in hand."
Wayward Swordtooth 91%
$4.18#986
"This creature can't attack or block unless you have the city's blessing."