Ulamog, the Defiler 
Legendary Creature — Eldrazi
$16.67 #1580 1.82 2.2 years
When you cast this spell, target opponent exiles the top half of their library, rounded up.
Ward—Sacrifice two permanents.
Ulamog enters with a number of +1/+1 counters on it equal to the greatest mana value among cards in exile.
Ulamog has annihilator X, where X is the number of +1/+1 counters on it.
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Cards similar to Ulamog, the Defiler 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.
Ulamog, the Ceaseless Hunger76%
$23.91↑#13431.60↓10.9 years↑
"Whenever this card attacks, defending player exiles the top twenty cards of their library."
+1 more matching line
Idol of False Gods76%
$0.29↓#5079↓0.48↓2.2 years
"As long as this artifact has eight or more +1/+1 counters on it, it's a 0/0 creature in addition to its other types and it has annihilator 2."
Ulamog's Dreadsire74%
$4.18↓#3429↓0.70↓2.2 years
"Ward—Sacrifice a permanent with mana value 1 or greater."
Lord Xander, the Collector71%
$2.63↓#7550↓1.08↓4.4 years↑
"Whenever this card attacks, defending player mills half their library, rounded down."