Souvenir Snatcher 
Creature — Bird
$1.09 #8813 0.50 6.5 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.)Flying
Whenever this creature mutates, gain control of target noncreature artifact.
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Cards similar to Souvenir Snatcher 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.
Dirge Bat87%
$0.32↓#80050.20↓6.5 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."
Master Thief84%
$0.15↓#16533↓1.18↑15.3 years↑
"When this creature enters, gain control of target artifact for as long as you control this creature."
Vulpikeet83%
$0.26↓#13072↓0.12↓6.5 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."
Aladdin82%
$0.57↓#22333↓0.25↓32.8 years↑
"
, 
: Gain control of target artifact for as long as you control this creature."
, : Gain control of target artifact for as long as you control this creature."
Frostwind Invoker82%
$0.08↓#29321↓0.11↓16.5 years↑
"Flying"
Dreamtail Heron81%
$0.12↓#6930↑0.00↓6.5 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."
Kukemssa Pirates80%
$2.25↑#23078↓0.71↑30.0 years↑
"Whenever this creature attacks and isn't blocked, you may gain control of target artifact defending player controls. If you do, this creature assigns no combat damage this turn."
Trumpeting Gnarr80%
$0.20↓#91930.06↓6.5 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."
Dack Fayden79%
$1.54↑#6897↑1.06↑12.4 years↑
"−2: Gain control of target artifact."
Mindleecher77%
$0.41↓#102960.24↓6.5 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."
Illuna, Apex of Wishes77%
$0.45↓#97990.22↓6.5 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."
Memnarch76%
$5.21↑#79500.96↑22.7 years↑
": Gain control of target artifact."
: Gain control of target artifact."
Aura Thief76%
$8.19↑#11218↓0.85↑27.4 years↑
"Flying"
Glowstone Recluse76%
$0.16↓#73130.13↓6.5 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."
Lorcan, Warlock Collector76%
$0.50↓#12302↓0.21↓5.2 years↓
"Flying"
Pyreswipe Hawk74%
$0.23↓#93920.24↓2.2 years↓
"Whenever you expend 6, gain control of up to one target artifact for as long as you control this creature."
Regal Leosaur74%
$0.22↓#16468↓0.07↓6.5 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."
Scarwood Bandits74%
$5.03↑#28282↓0.25↓32.2 years↑
", : Unless an opponent pays , gain control of target artifact for as long as this creature remains on the battlefield."
, : Unless an opponent pays , gain control of target artifact for as long as this creature remains on the battlefield."
Necropanther74%
$0.15↓#12937↓0.13↓6.5 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
Bilbo's Burglaring73%
$0.44↓#21929↓0.80↑0.2 years↓
"For each opponent, gain control of up to one target artifact that player controls."