Erratic Mutation 
Instant
$0.05 #29439 0.38 19.6 years
Choose target creature. Reveal cards from the top of your library until you reveal a nonland card. That creature gets +X/-X until end of turn, where X is that card's mana value. Put all cards revealed this way on the bottom of your library in any order.
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Cards similar to Erratic Mutation 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.
Induce Despair84%
$0.06↑#282710.2816.4 years↓
"Target creature gets -X/-X until end of turn, where X is the revealed card's mana value."
Erratic Explosion80%
$0.14↑#248820.07↓23.9 years↑
"Choose any target. Reveal cards from the top of your library until you reveal a nonland card. this card deals damage equal to that card's mana value to that permanent or player. Put the revealed cards on the bottom of your library in any order."
Auger Spree77%
$0.04↓#22353↑0.05↓13.9 years↓
"Target creature gets +4/-4 until end of turn."
Lash of Malice77%
$0.09↑#248970.27↓5.4 years↓
"Target creature gets +2/-2 until end of turn."
Spatial Contortion77%
$0.29↑#7923↑0.00↓10.7 years↓
"Target creature gets +3/-3 until end of turn."
Explosive Revelation76%
$0.11↑#266710.27↓16.4 years↓
"Choose any target. Reveal cards from the top of your library until you reveal a nonland card. this card deals damage equal to that card's mana value to that permanent or player. Put the nonland card into your hand and the rest on the bottom of your library in any order."
Goblin Machinist76%
$0.07↑#298550.3923.9 years↑
"
: Reveal cards from the top of your library until you reveal a nonland card. This creature gets +X/+0 until end of turn, where X is that card's mana value. Put the revealed cards on the bottom of your library in any order."
: Reveal cards from the top of your library until you reveal a nonland card. This creature gets +X/+0 until end of turn, where X is that card's mana value. Put the revealed cards on the bottom of your library in any order."
Flowstone Infusion74%
$0.11↑#243110.80↑4.0 years↓
"Target creature gets +2/-2 until end of turn."
Warped Physique70%
$0.04↓#258390.26↓13.3 years↓
"Target creature gets +X/-X until end of turn, where X is the number of cards in your hand."
Flowstone Strike70%
$0.07↑#317780.3626.6 years↑
"Target creature gets +1/-1 and gains haste until end of turn."