Emergent Woodwurm 
Creature — Wurm
$2.88 #6834 0.12 3.4 years
Backup 3 (When this creature enters, put three +1/+1 counters on target creature. If that's another creature, it gains the following ability until end of turn.)
Whenever this creature attacks, look at the top X cards of your library, where X is its power. You may put a permanent card with mana value X or less from among them onto the battlefield. Put the rest on the bottom of your library in a random order.
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Cards similar to Emergent Woodwurm 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.
Ayesha Tanaka, Armorer82%
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"Whenever this card attacks, look at the top four cards of your library. You may put any number of artifact cards with mana value less than or equal to this card's power from among them onto the battlefield tapped. Put the rest on the bottom of your library in a random order."
Guardian Scalelord79%
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"Backup 1"
+1 more matching line
Storm the Festival78%
$0.20↓#15270↓0.39↑4.9 years↑
"Look at the top five cards of your library. You may put up to two permanent cards with mana value 5 or less from among them onto the battlefield. Put the rest on the bottom of your library in a random order."
Raiders' Karve77%
$0.15↓#9489↓0.24↑5.6 years↑
"Whenever this Vehicle attacks, look at the top card of your library. If it's a land card, you may put it onto the battlefield tapped."
Bola Slinger74%
$0.06↓#21368↓0.153.4 years
"Backup 1"
Wilfred Mott74%
$0.29↓#13106↓0.67↑2.9 years
"At the beginning of your upkeep, put a time counter on this card. Then look at the top X cards of your library, where X is the number of time counters on this card. You may put a nonland permanent card with mana value 3 or less from among them onto the battlefield. Put the rest on the bottom of your library in a random order."
Mitotic Manipulation74%
$0.37↓#15157↓0.35↑15.6 years↑
"Look at the top seven cards of your library. You may put one of those cards onto the battlefield if it has the same name as a permanent. Put the rest on the bottom of your library in any order."
Jet, Rebel Leader74%
$0.24↓#12906↓0.00↓0.8 years↓
"Whenever this card attacks, look at the top five cards of your library. You may put a creature card with mana value 3 or less from among them onto the battlefield tapped and attacking. Put the rest on the bottom of your library in a random order."
Mobile Homestead74%
$0.20↓#12154↓0.50↑2.4 years
"Whenever this Vehicle attacks, look at the top card of your library. If it's a land card, you may put it onto the battlefield tapped."
N'Yami-Class Mother Ship72%
$0.55↓#12606↓0.00↓0.2 years↓
"Whenever this Vehicle deals combat damage to a player, look at the top card of your library. If it's a permanent card, you may put it onto the battlefield. If you don't put it onto the battlefield, put it into your hand."
Freestrider Lookout71%
$0.37↓#55330.50↑2.4 years
"Whenever you commit a crime, look at the top five cards of your library. You may put a land card from among them onto the battlefield tapped. Put the rest on the bottom of your library in a random order. This ability triggers only once each turn."
Wickerfolk Thresher70%
$0.25↓#10461↓0.091.9 years↓
"Whenever this creature attacks, if there are four or more card types among cards in your graveyard, look at the top card of your library. If it's a land card, you may put it onto the battlefield. If you don't put the card onto the battlefield, put it into your hand."
Owlbear Cub70%
$0.74↓#62090.054.2 years
"Whenever this creature attacks a player who controls eight or more lands, look at the top eight cards of your library. You may put a creature card from among them onto the battlefield tapped and attacking that player. Put the rest on the bottom of your library in a random order."
Syr Faren, the Hengehammer70%
$0.22↓#16218↓0.31↑6.9 years↑
"Whenever this card attacks, another target attacking creature gets +X/+X until end of turn, where X is this card's power."
Elspeth Resplendent70%
$4.72↑#5307↑0.25↑4.4 years
"−3: Look at the top seven cards of your library. You may put a permanent card with mana value 3 or less from among them onto the battlefield with a shield counter on it. Put the rest on the bottom of your library in a random order."
Arthur, Marigold Knight70%
$0.42↓#80230.69↑2.1 years↓
"Whenever this card and at least one other creature attack, look at the top six cards of your library. You may put a creature card from among them onto the battlefield tapped and attacking. Put the rest on the bottom of your library in a random order. Return that creature to its owner's hand at end of combat."
Genesis Wave70%
$0.35↓#1364↑0.49↑15.9 years↑
"Reveal the top X cards of your library. You may put any number of permanent cards with mana value X or less from among them onto the battlefield. Then put all cards revealed this way that weren't put onto the battlefield into your graveyard."