Treasure Keeper 
Artifact Creature — Construct
$0.12 #10819 0.04 9.6 years
When this creature dies, reveal cards from the top of your library until you reveal a nonland card with mana value 3 or less. You may cast that card without paying its mana cost. Put all revealed cards not cast this way on the bottom of your library in a random order.
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Cards similar to Treasure Keeper 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.
Primordial Gnawer86%
$0.11↓#19932↓0.39↑2.8 years↓
"When this creature dies, discover 3."
Plargg, Dean of Chaos // Augusta, Dean of Order81%
$0.35↑#118820.22↑5.4 years↓
"
, 
: Reveal cards from the top of your library until you reveal a nonlegendary, nonland card with mana value 3 or less. You may cast that card without paying its mana cost. Put all revealed cards not cast this way on the bottom of your library in a random order."
, : Reveal cards from the top of your library until you reveal a nonlegendary, nonland card with mana value 3 or less. You may cast that card without paying its mana cost. Put all revealed cards not cast this way on the bottom of your library in a random order."
Neera, Wild Mage80%
$0.25↑#8105↑0.47↑4.2 years↓
"Whenever you cast a spell, you may put it on the bottom of its owner's library. If you do, reveal cards from the top of your library until you reveal a nonland card. You may cast that card without paying its mana cost. Then put all revealed cards not cast this way on the bottom of your library in a random order. This ability triggers only once each turn."
Digsite Conservator80%
$0.10↓#19188↓0.31↑2.8 years↓
"When this creature dies, you may pay . If you do, discover 4."
. If you do, discover 4."
Dinosaur Egg79%
$0.42↑#5725↑0.18↑2.8 years↓
"When this creature dies, you may discover X, where X is its toughness."
Zoetic Glyph78%
$0.19↑#18004↓0.41↑2.8 years↓
"When this Aura is put into a graveyard from the battlefield, discover 3."
Creative Technique76%
$0.28↑#4783↑0.50↑5.4 years↓
"Shuffle your library, then reveal cards from the top of it until you reveal a nonland card. Exile that card and put the rest on the bottom of your library in a random order. You may cast the exiled card without paying its mana cost."
Annoyed Altisaur74%
$0.20↑#3970↑0.21↑5.8 years↓
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."
Enlisted Wurm74%
$0.11↓#18817↓0.44↑17.3 years↑
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."
Maelstrom Colossus74%
$0.34↑#4503↑0.38↑5.8 years↓
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."
Boarding Party74%
$0.25↑#7817↑0.005.8 years↓
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."
Shardless Agent74%
$0.34↑#7378↑0.0014.3 years↑
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."
Bloodbraid Elf74%
$0.15↑#4839↑0.32↑17.3 years↑
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."
Sunbird's Invocation74%
$0.25↑#1885↑0.32↑8.9 years
"Whenever you cast a spell from your hand, reveal the top X cards of your library, where X is that spell's mana value. You may cast a spell with mana value X or less from among cards revealed this way without paying its mana cost. Put the rest on the bottom of your library in a random order."
Enigma Sphinx74%
$0.26↑#14043↓0.50↑17.3 years↑
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."
Captured Sunlight74%
$0.12#21904↓0.0617.3 years↑
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."
Into the Time Vortex73%
$0.26↑#5318↑0.35↑2.9 years↓
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."
Improvisation Capstone73%
$10.94↑#2932↑0.000.4 years↓
"Exile cards from the top of your library until you exile cards with total mana value 4 or greater. You may cast any number of spells from among them without paying their mana costs."
Solstice Revelations73%
$0.20↑#7153↑0.000.8 years↓
"Exile cards from the top of your library until you exile a nonland card. You may cast that card without paying its mana cost if the spell's mana value is less than the number of Mountains you control. If you don't cast that card this way, put it into your hand."
Meteoric Mace72%
$0.17↑#93290.53↑5.8 years↓
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."