Behind the Mask 
Instant
$0.11 #18818 0.05 2.6 years
As an additional cost to cast this spell, you may collect evidence 6. (Exile cards with total mana value 6 or greater from your graveyard.)
Until end of turn, target artifact or creature becomes an artifact creature with base power and toughness 4/3. If evidence was collected, it has base power and toughness 1/1 until end of turn instead.
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Cards similar to Behind the Mask 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.
I Am Iron Man84%
$0.19↑#174680.000.2 years↓
"Until end of turn, target artifact or creature becomes an artifact creature with base power and toughness 4/4 and gains flying."
Relic's Roar84%
$0.16↑#192360.17↑2.8 years
"Until end of turn, target artifact or creature becomes a Dinosaur artifact creature with base power and toughness 4/3 in addition to its other types."
Mind Transfer Protocol82%
$0.12↑#207600.000.5 years↓
"Until end of turn, target artifact or creature becomes an artifact creature with base power and toughness 4/5."
Extract a Confession82%
$0.22↑#10412↑0.42↑2.6 years
"As an additional cost to cast this spell, you may collect evidence 6."
+1 more matching line
Vitu-Ghazi Inspector80%
$0.14↑#26167↓0.18↑2.6 years
"As an additional cost to cast this spell, you may collect evidence 6."
Majestic Metamorphosis79%
$0.07↓#214560.004.4 years↑
"Until end of turn, target artifact or creature becomes a 4/4 Angel artifact creature and gains flying."
Analyze the Pollen78%
$0.34↑#7298↑0.24↑2.6 years
"As an additional cost to cast this spell, you may collect evidence 8."
Suit Up77%
$0.10↓#191490.004.5 years↑
"Until end of turn, target creature or Vehicle becomes an artifact creature with base power and toughness 4/5."
Conspiracy Unraveler76%
$0.25↑#14684↑0.29↑2.6 years
"You may collect evidence 10 rather than pay the mana cost for spells you cast."
Iron Man, Futurist Paragon74%
$1.91↑#179540.000.2 years↓
"At the beginning of combat on your turn, target artifact or creature becomes an artifact creature with base power and toughness 5/5 and gains flying."
Karn's Touch72%
$0.39↑#26872↓0.53↑26.9 years↑
"Target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value until end of turn."
Crimestopper Sprite72%
$0.05↓#24731↓0.60↑2.6 years
"As an additional cost to cast this spell, you may collect evidence 6."
Diminish72%
$0.04↓#198820.23↑16.1 years↑
"Target creature has base power and toughness 1/1 until end of turn."
Bite Down on Crime71%
$0.06↓#25462↓0.26↑2.6 years
"As an additional cost to cast this spell, you may collect evidence 6. This spell costs 
less to cast if evidence was collected."
less to cast if evidence was collected."+1 more matching line
Yotia Declares War70%
$0.07↓#213080.004.0 years↑
"Up to one target artifact you control becomes an artifact creature with base power and toughness 4/4 until end of turn."
Humble70%
$0.14↑#219460.69↑27.9 years↑
"Until end of turn, target creature loses all abilities and has base power and toughness 0/1."
Ovinize70%
$0.09↓#172340.0919.6 years↑
"Until end of turn, target creature loses all abilities and has base power and toughness 0/1."
Square Up70%
$0.07↓#27489↓0.63↑5.4 years↑
"Target creature has base power and toughness 4/4 until end of turn."
Mercurial Transformation70%
$0.26↑#173490.22↑5.4 years↑
"Until end of turn, target nonland permanent loses all abilities and becomes your choice of a blue Frog creature with base power and toughness 1/1 or a blue Octopus creature with base power and toughness 4/4."
Snakeform70%
$0.16↑#198890.29↑18.1 years↑
"Until end of turn, target creature loses all abilities and becomes a green Snake with base power and toughness 1/1."