Galvanoth 
Creature — Beast
$0.31 #13054 0.20 15.6 years
At the beginning of your upkeep, you may look at the top card of your library. You may cast it without paying its mana cost if it's an instant or sorcery spell.
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Cards similar to Galvanoth 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.
Zaffai and the Tempests83%
$0.23↓#126930.00↓0.4 years↓
"Once during each of your turns, you may cast an instant or sorcery spell from your hand without paying its mana cost."
Omnispell Adept83%
$0.23↓#19012↓0.41↑7.9 years↓
"
, 
: You may cast an instant or sorcery spell from your hand without paying its mana cost."
, : You may cast an instant or sorcery spell from your hand without paying its mana cost."
Johann, Apprentice Sorcerer82%
$0.26↓#125450.40↑3.0 years↓
"Once each turn, you may cast an instant or sorcery spell from the top of your library."
Planetarium of Wan Shi Tong80%
$5.76↑#3803↑0.00↓0.8 years↓
"Whenever you scry or surveil, look at the top card of your library. You may cast that card without paying its mana cost. Do this only once each turn."
Rashmi, Eternities Crafter80%
$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."
Powerbalance78%
$0.32↑#2443↑0.41↑2.2 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."
Delver of Secrets // Insectile Aberration78%
$0.26↓#16017↓0.50↑14.9 years
"At the beginning of your upkeep, look at the top card of your library. You may reveal that card. If an instant or sorcery card is revealed this way, transform this creature."
Precognition Field78%
$0.30↓#146850.05↓8.4 years↓
"You may cast instant and sorcery spells from the top of your library."
Descendants' Path78%
$0.91↑#2182↑0.33↑14.3 years↓
"At the beginning of your upkeep, reveal the top card of your library. If it's a creature card that shares a creature type with a creature you control, you may cast it without paying its mana cost. If you don't cast it, put it on the bottom of your library."
One with the Multiverse76%
$2.65↑#1919↑0.74↑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."
Talent of the Telepath74%
$0.65↑#10314↑0.65↑11.1 years↓
"Target opponent reveals the top seven cards of their library. You may cast an instant or sorcery spell from among them without paying its mana cost. Then that player puts the rest into their graveyard."
Efreet Flamepainter74%
$0.33↑#154090.135.4 years↓
"Whenever this creature deals combat damage to a player, you may cast target instant or sorcery card from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Surtland Elementalist72%
$0.24↓#17279↓0.07↓5.6 years↓
"Whenever this creature attacks, you may cast an instant or sorcery spell from your hand without paying its mana cost."
Leaf-Crowned Elder72%
$8.47↑#107090.2418.6 years↑
"At the beginning of your upkeep, you may look at the top card of your library. If it shares a creature type with this creature, you may reveal it. If you do, you may play that card without paying its mana cost."
Melek, Izzet Paragon72%
$0.19↓#7411↑0.3013.4 years↓
"You may cast instant and sorcery spells from the top of your library."
Daring Waverider72%
$0.24↓#8881↑0.38↑2.1 years↓
"When this creature enters, you may cast target instant or sorcery card with mana value 4 or less from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Epic Experiment71%
$0.28↓#6185↑0.42↑13.9 years↓
"Exile the top X cards of your library. You may cast instant and sorcery spells with mana value X or less from among them without paying their mana costs. Then put all cards exiled this way that weren't cast into your graveyard."
Goblin Dark-Dwellers71%
$0.26↓#8945↑0.00↓10.6 years↓
"When this creature enters, you may cast target instant or sorcery card with mana value 3 or less from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Jadzi, Oracle of Arcavios // Journey to the Oracle70%
$0.60↑#105460.61↑5.4 years↓
"Whenever you cast or copy an instant or sorcery spell, reveal the top card of your library. If it's a nonland card, you may cast it by paying 
rather than paying its mana cost. If it's a land card, put it onto the battlefield."
rather than paying its mana cost. If it's a land card, put it onto the battlefield."
Brain in a Jar70%
$0.30↓#18850↓0.07↓10.4 years↓
", : Put a charge counter on this artifact, then you may cast an instant or sorcery spell with mana value equal to the number of charge counters on this artifact from your hand without paying its mana cost."
, : Put a charge counter on this artifact, then you may cast an instant or sorcery spell with mana value equal to the number of charge counters on this artifact from your hand without paying its mana cost."