Rumbling Ruin 
Creature — Elemental
$0.15 #25957 0.29 7.6 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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$0.06↓#12986↑0.00↓11.9 years↑
"If you control a creature with power 4 or greater, creatures can't block this turn."