Cosmic Cube 
Artifact
$11.80 #6240 0.00 0.2 years
Ward 
Whenever you attack, look at the top six cards of your library. You may cast a spell from among them with mana value less than or equal to the greatest power among attacking creatures you control without paying its mana cost. Put the rest on the bottom of your library in a random order.
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Cards similar to Cosmic Cube 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.
Velomachus Lorehold85%
$0.31↓#7515↓0.45↑5.4 years↑
"Whenever this card attacks, look at the top seven cards of your library. You may cast an instant or sorcery spell with mana value less than or equal to this card's power from among them without paying its mana cost. Put the rest on the bottom of your library in a random order."
Tomakul Honor Guard84%
$0.03↓#29946↓0.29↑3.8 years↑
"Ward "
"
Lionheart Glimmer84%
$0.22↓#11992↓0.11↑1.9 years↑
"Ward "
"
Waterfall Aerialist84%
$0.04↓#29133↓0.005.4 years↑
"Ward "
"
Punk Frogs82%
$0.14↓#24147↓0.000.5 years
"Ward 
"
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Rimeshield Frost Giant82%
$0.10↓#25186↓0.13↑5.1 years↑
"Ward "
"
Sunbird's Invocation82%
$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."
Pummeler for Hire82%
$0.11↓#25944↓0.000.6 years
"Ward "
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Leonin Lightbringer82%
$0.15↓#22421↓0.20↑3.6 years↑
"Ward "
"
Campus Composer // Aqueous Aria81%
$0.15↓#23667↓0.000.4 years
"Ward "
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Spider-Rex, Daring Dino80%
$0.22↓#9153↓0.57↑1.0 years
"Ward "
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Archive Dragon80%
$0.15↓#15332↓0.003.0 years↑
"Ward "
"
Toadstool Admirer80%
$0.11↓#25394↓0.29↑3.0 years↑
"Ward "
"
Aegis Sculptor80%
$0.09↓#21960↓0.15↑1.4 years↑
"Ward "
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Cactusfolk Sureshot80%
$0.34↓#58130.10↑2.4 years↑
"Ward "
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Patchwork Automaton80%
$0.17↓#71000.22↑4.5 years↑
"Ward "
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Cackling Prowler80%
$0.10↓#18630↓0.15↑1.8 years↑
"Ward "
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Kiora, Sovereign of the Deep80%
$1.61↓#8721↓0.33↑3.3 years↑
"Whenever you cast a Kraken, Leviathan, Octopus, or Serpent spell from your hand, look at the top X cards of your library, where X is that spell's mana value. You may cast a spell with mana value less than X from among them without paying its mana cost. Put the rest on the bottom of your library in a random order."
+1 more matching line
Frostfist Strider80%
$0.14↓#22708↓0.25↑4.0 years↑
"Ward "
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Hamlet Vanguard80%
$0.23↓#18063↓0.26↑4.8 years↑
"Ward "
"