Vizier of the Menagerie 

Creature — Snake Cleric
You may look at the top card of your library any time.
You may cast creature spells from the top of your library.
You can spend mana of any type to cast creature spells.
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Cards that do something similar 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.
Ranger Class 100%
$0.43#7487
"You may cast creature spells from the top of your library."
+1 more matching line
Eladamri, Korvecdal 100%
$3.76#2091
"You may cast creature spells from the top of your library."
+1 more matching line
Vivien, Monsters' Advocate 100%
$2.95#6254
"You may cast creature spells from the top of your library."
+1 more matching line
Garruk's Horde 100%
$0.18#9151
"You may cast creature spells from the top of your library."
+1 more matching line
Elven Chorus 100%
$4.21#1376
"You may cast creature spells from the top of your library."
+1 more matching line
Hogaak, Arisen Necropolis 84%
$1.27#10356
"You can't spend mana to cast this spell."
+1 more matching line
Vivien, Champion of the Wilds 83%
$0.76#3841
"You may cast creature spells as though they had flash."
Realmwalker 88%
$1.11#607
"You may cast creature spells of the chosen type from the top of your library."
+1 more matching line
Elsha of the Infinite 85%
$0.65#6506
"You may cast noncreature spells from the top of your library. If you cast a spell this way, you may cast it as though it had flash."
+1 more matching line