Primeval Spawn 
Creature — Avatar
$0.43 #10563 0.36 4.0 years
If this creature would enter and it wasn't cast or no mana was spent to cast it, exile it instead.
Vigilance, trample, lifelink
When this creature leaves the battlefield, exile the top ten cards of your library. You may cast any number of spells with total mana value 10 or less from among them without paying their mana costs.
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Cards similar to Primeval Spawn 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.
Hazoret's Undying Fury80%
$0.26↓#24004↓0.23↓9.1 years↑
"Shuffle your library, then exile the top four cards. You may cast any number of spells with mana value 5 or less from among them without paying their mana costs. Lands you control don't untap during your next untap step."
Improvisation Capstone72%
$10.94↑#2932↑0.00↓0.4 years↓
"Exile cards from the top of your library until you exile cards with total mana value 4 or greater. You may cast any number of spells from among them without paying their mana costs."
Dream Harvest72%
$0.38↓#6462↑0.00↓0.6 years↓
"Each opponent exiles cards from the top of their library until they have exiled cards with total mana value 5 or greater this way. Until end of turn, you may cast cards exiled this way without paying their mana costs."
Moldering Karok72%
$0.11↓#22972↓0.00↓5.4 years↑
"Trample, lifelink"
Dance with Calamity72%
$0.29↓#4272↑0.50↑3.4 years
"Shuffle your library. As many times as you choose, you may exile the top card of your library. If the total mana value of the cards exiled this way is 13 or less, you may cast any number of spells from among those cards without paying their mana costs."
Let the Galaxy Burn72%
$0.64↑#96430.433.9 years
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."