Kiora, Sovereign of the Deep 
Legendary Creature — Merfolk Noble
$1.61 #8721 0.33 3.3 years
Vigilance, ward
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.
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Cards similar to Kiora, Sovereign of the Deep 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.
Sunbird's Invocation89%
$0.25↓#1885↑0.328.9 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."
Cosmic Cube80%
$11.80↑#6240↑0.00↓0.2 years↓
"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."
Rashmi, Eternities Crafter77%
$0.39↓#3551↑0.259.9 years↑
"Whenever you cast your first spell each turn, reveal the top card of your library. You may cast it without paying its mana cost if it's a spell with lesser mana value. If you don't cast it, put it into your hand."
Pippin, Guard of the Citadel76%
$0.68↓#3196↑0.423.2 years
"Vigilance, ward 
"
"
Hraesvelgr of the First Brood74%
$0.28↓#79130.271.2 years↓
"Flying, vigilance, ward 
"
"
Svella, Ice Shaper74%
$0.16↓#6962↑0.255.6 years↑
"
, 
: Look at the top four cards of your library. You may cast a spell from among them without paying its mana cost. Put the rest on the bottom of your library in a random order."
, : Look at the top four cards of your library. You may cast a spell from among them without paying its mana cost. Put the rest on the bottom of your library in a random order."
Aetherworks Marvel73%
$0.30↓#3523↑0.55↑9.9 years↑
", Pay six 
: Look at the top six cards of your library. You may cast a spell from among them without paying its mana cost. Put the rest on the bottom of your library in a random order."
, Pay six : Look at the top six cards of your library. You may cast a spell from among them without paying its mana cost. Put the rest on the bottom of your library in a random order."
Eshki Dragonclaw72%
$0.30↓#10784↓0.16↓1.4 years↓
"Vigilance, trample, ward "
"
Ratadrabik of Urborg72%
$0.71↓#2841↑0.51↑4.0 years
"Vigilance, ward "
"
Perception Bobblehead72%
$2.12↑#5954↑0.06↓2.5 years
", : Look at the top X cards of your library, where X is the number of Bobbleheads you control. You may cast a spell with mana value 3 or less from among them without paying its mana cost. Put the rest on the bottom of your library in a random order."
, : Look at the top X cards of your library, where X is the number of Bobbleheads you control. You may cast a spell with mana value 3 or less from among them without paying its mana cost. Put the rest on the bottom of your library in a random order."
Marauding Sphinx71%
$0.18↓#18800↓0.252.4 years
"Flying, vigilance, ward "
"
Kenessos, Priest of Thassa71%
$7.93↑#96570.62↑3.8 years
"
: Look at the top card of your library. If it's a Kraken, Leviathan, Octopus, or Serpent creature card, you may put it onto the battlefield. If you don't put the card onto the battlefield, you may put it on the bottom of your library."
: Look at the top card of your library. If it's a Kraken, Leviathan, Octopus, or Serpent creature card, you may put it onto the battlefield. If you don't put the card onto the battlefield, you may put it on the bottom of your library."
Velomachus Lorehold70%
$0.31↓#75150.45↑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."