Owlbear Cub 
Creature — Bird Bear
$0.74 #6209 0.05 4.2 years
Mama's Coming — 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.
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Cards similar to Owlbear Cub 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.
Jet, Rebel Leader88%
$0.24↓#12906↓0.000.8 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."
Arthur, Marigold Knight84%
$0.42↓#8023↓0.69↑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."
Horn of the Mark80%
$0.52↓#4271↑0.28↑3.2 years↓
"Whenever two or more creatures you control attack a player, look at the top five cards of your library. You may reveal a creature card from among them and put it into your hand. Put the rest on the bottom of your library in a random order."
Web of Life and Destiny78%
$1.31↑#72330.82↑1.0 years↓
"At the beginning of combat on your turn, look at the top five cards of your library. You may put a creature card from among them onto the battlefield. Put the rest on the bottom of your library in a random order."
Raiders' Karve76%
$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."
Call to the Kindred75%
$1.13↑#10857↓0.22↑14.6 years↑
"At the beginning of your upkeep, you may look at the top five cards of your library. If you do, you may put a creature card that shares a creature type with enchanted creature from among them onto the battlefield, then you put the rest of those cards on the bottom of your library in any order."
Industrial Advancement75%
$5.46↑#65180.29↑4.4 years
"At the beginning of your end step, you may sacrifice a creature. If you do, look at the top X cards of your library, where X is that creature's mana value. You may put a creature card from among them onto the battlefield. Put the rest on the bottom of your library in a random order."
Mobile Homestead73%
$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."
Loot, Exuberant Explorer72%
$3.08↑#907↑0.59↑1.8 years↓
"
, 
: Look at the top six cards of your library. You may reveal a creature card with mana value less than or equal to the number of lands you control from among them and put it onto the battlefield. Put the rest on the bottom in a random order."
, : Look at the top six cards of your library. You may reveal a creature card with mana value less than or equal to the number of lands you control from among them and put it onto the battlefield. Put the rest on the bottom in a random order."
Lurking Predators72%
$18.87↑#3159↑0.53↑17.1 years↑
"Whenever an opponent casts a spell, reveal the top card of your library. If it's a creature card, put it onto the battlefield. Otherwise, you may put that card on the bottom of your library."
Mayael the Anima72%
$1.73↑#15074↓0.50↑17.9 years↑
"
, : Look at the top five cards of your library. You may put a creature card with power 5 or greater from among them onto the battlefield. Put the rest on the bottom of your library in any order."
, : Look at the top five cards of your library. You may put a creature card with power 5 or greater from among them onto the battlefield. Put the rest on the bottom of your library in any order."
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."
Emergent Woodwurm70%
$2.88↑#68340.123.4 years
"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."
Birthing Ritual70%
$3.85↑#4461↑0.69↑2.2 years↓
"At the beginning of your end step, if you control a creature, look at the top seven cards of your library. Then you may sacrifice a creature. If you do, you may put a creature card with mana value X or less from among those cards onto the battlefield, where X is 1 plus the sacrificed creature's mana value. Put the rest on the bottom of your library in a random order."
Ojer Kaslem, Deepest Growth // Temple of Cultivation70%
$6.89↑#2003↑0.54↑2.8 years↓
"Whenever this card deals combat damage to a player, reveal that many cards from the top of your library. You may put a creature card and/or a land card from among them onto the battlefield. Put the rest on the bottom in a random order."