Sunbird's Invocation 
Enchantment
$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.
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Cards similar to Sunbird's Invocation 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.
Rashmi, Eternities Crafter90%
$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."
Kiora, Sovereign of the Deep89%
$1.61↑#8721↓0.333.3 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."
Svella, Ice Shaper83%
$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 Marvel82%
$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."
Cosmic Cube82%
$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."
Perception Bobblehead80%
$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."
Velomachus Lorehold78%
$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."
Discover the Impossible77%
$0.19↓#18389↓0.06↓4.5 years↓
"Look at the top five cards of your library. Exile one of them face down 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 if it's an instant spell with mana value 2 or less. If you don't, put that card into your hand."
Neera, Wild Mage76%
$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."
Collected Conjuring75%
$0.32↑#20215↓0.53↑7.2 years↓
"Exile the top six cards of your library. You may cast up to two sorcery spells with mana value 3 or less from among them without paying their mana costs. Put the exiled cards not cast this way on the bottom of your library in a random order."
Treasure Keeper74%
$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."
One with the Multiverse74%
$2.65↑#19190.74↑3.8 years↓
"Once during each of your turns, you may cast a spell from your hand or the top of your library without paying its mana cost."
Manaplasm74%
$0.18↓#16329↓0.4017.9 years↑
"Whenever you cast a spell, this creature gets +X/+X until end of turn, where X is that spell's mana value."
Jodah, the Unifier72%
$2.98↑#2856↓1.94↑4.0 years↓
"Whenever you cast a legendary spell from your hand, exile cards from the top of your library until you exile a legendary nonland card with lesser mana value. You may cast that card without paying its mana cost. Put the rest on the bottom of your library in a random order."
Powerbalance72%
$0.32↑#2443↓0.412.2 years↓
"Whenever an opponent casts a spell, you may reveal the top card of your library. If you do, you may cast that card without paying its mana cost if the two spells have the same mana value."
Monstrous Vortex70%
$0.36↑#21730.45↑2.2 years↓
"Whenever you cast a creature spell with power 5 or greater, discover X, where X is that spell's mana value."
Muse Vortex70%
$0.28↑#17105↓0.415.4 years↓
"Exile the top X cards of your library. You may cast an instant or sorcery spell with mana value X or less from among them without paying its mana cost. Then put the exiled instant and sorcery cards that weren't cast this way into your hand and the rest on the bottom of your library in a random order."