Garruk's Harbinger 
Creature — Beast
$0.21 #13887 0.27 6.2 years
Hexproof from black
Whenever this creature deals combat damage to a player or planeswalker, look at that many cards from the top of your library. You may reveal a creature card or Garruk planeswalker card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.
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Cards similar to Garruk's Harbinger 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.
Doomskar Warrior75%
$0.10↓#143660.06↓3.4 years↓
"Whenever this creature deals combat damage to a player or battle, look at that many cards from the top of your library. You may reveal a creature or land card from among them and put it into your hand. Put the rest on the bottom of your library in a random order."
Cabaretti Ascendancy74%
$0.25↑#142600.374.4 years↓
"At the beginning of your upkeep, look at the top card of your library. If it's a creature or planeswalker card, you may reveal it and put it into your hand. If you don't put the card into your hand, you may put it on the bottom of your library."
Vine Mare72%
$0.13↓#23017↓0.258.1 years↑
"Hexproof"
Vivien's Grizzly72%
$0.13↓#135850.247.3 years↑
"
: Look at the top card of your library. If it's a creature or planeswalker card, you may reveal it and put it into your hand. If you don't put the card into your hand, put it on the bottom of your library."
: Look at the top card of your library. If it's a creature or planeswalker card, you may reveal it and put it into your hand. If you don't put the card into your hand, put it on the bottom of your library."
Knight of Grace70%
$0.15↓#17292↓0.228.4 years↑
"Hexproof from black"
Lone Revenant70%
$0.10↓#30107↓0.3314.3 years↑
"Hexproof"
+1 more matching line
Carth the Lion70%
$0.31↑#7014↑0.69↑5.3 years
"Whenever Carth enters or a planeswalker you control dies, look at the top seven cards of your library. You may reveal a planeswalker card from among them and put it into your hand. Put the rest on the bottom of your library in a random order."