Yuna's Whistle 
Instant
$0.20 #8564 0.36 1.2 years
Reveal cards from the top of your library until you reveal a creature card. Put that card into your hand and the rest on the bottom of your library in a random order. When you reveal a creature card this way, put X +1/+1 counters on target creature you control, where X is the mana value of that card.
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Cards similar to Yuna's Whistle 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.
Treasure Hunt76%
$0.35↑#16146↓0.06↓16.6 years↑
"Reveal cards from the top of your library until you reveal a nonland card, then put all cards revealed this way into your hand."
Calibrated Blast74%
$0.18↓#20068↓0.00↓5.3 years↑
"Reveal cards from the top of your library until you reveal a nonland card. Put the revealed cards on the bottom of your library in a random order. When you reveal a nonland card this way, this card deals damage equal to that card's mana value to any target."
Explosive Revelation72%
$0.11↓#26671↓0.2716.4 years↑
"Choose any target. Reveal cards from the top of your library until you reveal a nonland card. this card deals damage equal to that card's mana value to that permanent or player. Put the nonland card into your hand and the rest on the bottom of your library in any order."
Fathom Trawl71%
$0.27↑#26609↓0.24↓18.9 years↑
"Reveal cards from the top of your library until you reveal three nonland cards. Put the nonland cards revealed this way into your hand, then put the rest of the revealed cards on the bottom of your library in any order."
Abundant Harvest71%
$0.17↓#68780.20↓5.4 years↑
"Choose land or nonland. Reveal cards from the top of your library until you reveal a card of the chosen kind. Put that card into your hand and the rest on the bottom of your library in a random order."
Spinner of Souls70%
$0.51↑#3904↑0.21↓1.8 years
"Whenever another nontoken creature you control dies, you may reveal cards from the top of your library until you reveal a creature card. Put that card into your hand and the rest on the bottom of your library in a random order."