Omarthis, Ghostfire Initiate {X}{X}
Legendary Creature — Spirit Snake
Omarthis enters with X +1/+1 counters on it.
Whenever you put one or more +1/+1 counters on another colorless creature, you may put a +1/+1 counter on Omarthis.
When Omarthis dies, manifest a number of cards from the top of your library equal to the number of counters on it.
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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.
Ojer Pakpatiq, Deepest Epoch // Temple of Cyclical Time 83%
$3.72#3047
"When this card dies, return it to the battlefield tapped and transformed under its owner's control with three time counters on it."
Bucky Barnes, Eager Ally 81%
$0.42#24971
"When this card dies, look at the top four cards of your library. You may reveal an Equipment, Hero, or Soldier card from among them and put it into your hand. Put the rest on the bottom of your library in a random order."
Elenda, the Dusk Rose 80%
$5.11#1223
"When this card dies, create X 1/1 white Vampire creature tokens with lifelink, where X is this card's power."
Prime Speaker Zegana 85%
$0.18#2754
"this card enters with X +1/+1 counters on it, where X is the greatest power among other creatures you control."