Rumbling Ruin 
Creature — Elemental
$0.15 #26214 0.41 7.7 years
When this creature enters, count the number of +1/+1 counters on creatures you control. Creatures your opponents control with power less than or equal to that number can't block this turn.
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Cards similar to Rumbling Ruin 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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$0.57↑#20399↑0.11↓15.7 years↑
"Whenever this creature attacks, creatures with power 1 or less can't block this turn."
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$0.23↑#7519↑0.4412.1 years↑
"• Creatures with power 3 or less can't block this turn."
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$4.34↑#8666↑0.57↑2.7 years↓
"When this card enters, creatures target player controls can't block this turn."
Barrage of Boulders70%
$0.06↓#13156↑0.05↓12.1 years↑
"If you control a creature with power 4 or greater, creatures can't block this turn."