Skulduggery 
Instant
$0.06 #19539 0.36 8.9 years
Until end of turn, target creature you control gets +1/+1 and target creature an opponent controls gets -1/-1.
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Cards similar to Skulduggery 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.
Steal Strength98%
$0.10↑#30502↓0.2926.3 years↑
"Target creature gets +1/+1 until end of turn. Another target creature gets -1/-1 until end of turn."
Leeching Bite96%
$0.09↑#30271↓0.21↓15.3 years↑
"Target creature gets +1/+1 until end of turn. Another target creature gets -1/-1 until end of turn."
Consume Strength96%
$0.13↑#27438↓0.18↓25.3 years↑
"Target creature gets +2/+2 until end of turn. Another target creature gets -2/-2 until end of turn."
Rites of Reaping96%
$0.07↑#30365↓0.55↑13.9 years↑
"Target creature gets +3/+3 until end of turn. Another target creature gets -3/-3 until end of turn."
Rookie Mistake94%
$0.04↓#28286↓0.00↓6.2 years↓
"Until end of turn, target creature gets +0/+2 and another target creature gets -2/-0."
Schismotivate94%
$0.36↑#25964↓0.19↓20.6 years↑
"Target creature gets +4/+0 until end of turn. Another target creature gets -4/-0 until end of turn."
Gurmag Rakshasa94%
$0.10↑#216080.06↓1.4 years↓
"When this creature enters, target creature an opponent controls gets -2/-2 until end of turn and target creature you control gets +2/+2 until end of turn."
Monoist Circuit-Feeder92%
$0.13↑#211430.24↓1.1 years↓
"When this creature enters, until end of turn, target creature you control gets +X/+0 and target creature an opponent controls gets -0/-X, where X is the number of artifacts you control."
Borrowed Malevolence90%
$0.06#27457↓0.21↓10.1 years↑
"• Target creature gets +1/+1 until end of turn."
Dissection Practice90%
$0.24↑#173430.00↓0.4 years↓
"Up to one target creature gets -1/-1 until end of turn."
Subtle Strike88%
$0.05↓#197590.19↓9.9 years
"• Target creature gets -1/-1 until end of turn."
Azula Always Lies88%
$0.15↑#10780↑0.00↓0.8 years↓
"• Target creature gets -1/-1 until end of turn."
Gloom Ripper84%
$0.27↑#11933↑0.00↓0.6 years↓
"When this creature enters, target creature you control gets +X/+0 until end of turn and up to one target creature an opponent controls gets -0/-X until end of turn, where X is the number of Elves you control plus the number of Elf cards in your graveyard."
Drooling Groodion84%
$0.03↓#30182↓0.75↑20.9 years↑
"
, Sacrifice a creature: Target creature gets +2/+2 until end of turn. Another target creature gets -2/-2 until end of turn."
, Sacrifice a creature: Target creature gets +2/+2 until end of turn. Another target creature gets -2/-2 until end of turn."
Karai's Technique83%
$0.20↑#177780.00↓0.5 years↓
"• Target creature gets +3/+3 until end of turn."
Stab82%
$0.17↑#10887↑0.18↓1.8 years↓
"Target creature gets -2/-2 until end of turn."
Disfigure82%
$0.05↓#161840.21↓16.9 years↑
"Target creature gets -2/-2 until end of turn."
Cankerous Thirst82%
$0.14↑#29237↓0.4018.1 years↑
"If was spent to cast this spell, you may have target creature get -3/-3 until end of turn. If was spent to cast this spell, you may have target creature get +3/+3 until end of turn."
was spent to cast this spell, you may have target creature get -3/-3 until end of turn. If was spent to cast this spell, you may have target creature get +3/+3 until end of turn."
Zealous Persecution82%
$0.15↑#198570.65↑17.3 years↑
"Until end of turn, creatures you control get +1/+1 and creatures your opponents control get -1/-1."
Sick and Tired80%
$0.10↑#31039↓0.00↓27.6 years↑
"Two target creatures each get -1/-1 until end of turn."