Auspicious Starrix 
Creature — Elk Beast
$0.26 #6726 0.19 6.4 years
Mutate 
(If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
(If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)Whenever this creature mutates, exile cards from the top of your library until you exile X permanent cards, where X is the number of times this creature has mutated. Put those permanent cards onto the battlefield.
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Cards similar to Auspicious Starrix 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.
Illuna, Apex of Wishes80%
$0.48↑#9600↓0.206.4 years
"Whenever this creature mutates, exile cards from the top of your library until you exile a nonland permanent card. Put that card onto the battlefield or into your hand."
+1 more matching line
Raph & Mikey, Troublemakers79%
$2.77↑#67880.00↓0.5 years↓
"Whenever this card attack, reveal cards from the top of your library until you reveal a creature card. Put that card onto the battlefield tapped and attacking and the rest on the bottom of your library in a random order."
Aurora Awakener78%
$0.70↑#9731↓0.00↓0.6 years↓
"When this creature enters, reveal cards from the top of your library until you reveal X permanent cards, where X is the number of colors among permanents you control. Put any number of those permanent cards onto the battlefield, then put the rest of the revealed cards on the bottom of your library in a random order."
Thicket Elemental78%
$0.19↓#20092↓0.2225.9 years↑
"When this creature enters, if it was kicked, you may reveal cards from the top of your library until you reveal a creature card. If you do, put that card onto the battlefield and shuffle all other cards revealed this way into your library."
Genesis Storm77%
$0.65↑#13001↓0.07↓8.1 years↑
"Reveal cards from the top of your library until you reveal a nonland permanent card. You may put that card onto the battlefield. Then put all cards revealed this way that weren't put onto the battlefield on the bottom of your library in a random order."
Clifftop Lookout74%
$0.32↑#2709↑0.242.1 years↓
"When this creature enters, reveal cards from the top of your library until you reveal a land card. Put that card onto the battlefield tapped and the rest on the bottom of your library in a random order."
Trumpeting Gnarr74%
$0.19↓#8988↓0.05↓6.4 years
"Mutate 
If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it."
If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it."+1 more matching line
Parcelbeast71%
$0.22↓#71740.286.4 years
"Mutate 
If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it."
If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it."
Atla Palani, Nest Tender70%
$1.07↑#4502↑0.55↑7.0 years
"Whenever an Egg you control dies, reveal cards from the top of your library until you reveal a creature card. Put that card onto the battlefield and the rest on the bottom of your library in a random order."
The Regalia70%
$1.05↑#2542↑0.291.2 years↓
"Whenever this card attacks, reveal cards from the top of your library until you reveal a land card. Put that card onto the battlefield tapped and the rest on the bottom of your library in a random order."