Devilish Valet 
Creature — Devil Warrior
$0.32 #3519 0.24 4.5 years
Trample, haste
Alliance — Whenever another creature you control enters, double this creature's power until end of turn.
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Cards similar to Devilish Valet 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.
Tifa Lockhart88%
$2.54↑#2635↑1.03↑1.8 years↓
"Whenever a land you control enters, double this card's power until end of turn."
+1 more matching line
Nylea's Colossus87%
$4.51↑#7479↓0.00↓8.2 years↑
"Whenever this creature or another enchantment you control enters, double target creature's power and toughness until end of turn."
Arni, Renowned Champion84%
$0.15↓#26706↓0.10↓0.0 years↓
"Whenever another creature you control enters, this card gets +X/+0 until end of turn, where X is that creature's power."
+1 more matching line
Railway Brawler84%
$5.81↑#2547↑0.36↑2.5 years↓
"Whenever another creature you control enters, put X +1/+1 counters on it, where X is its power."
Mightform Harmonizer84%
$2.29↑#30450.58↑1.2 years↓
"Whenever a land you control enters, double the power of target creature you control until end of turn."
Madame Null, Power Broker83%
$0.37↑#9725↓0.320.6 years↓
"Whenever another creature you control enters, you may pay life equal to its power. If you do, put that many +1/+1 counters on it."
Brambleguard Captain80%
$0.20↓#11924↓0.05↓2.2 years↓
"At the beginning of combat on your turn, target creature you control gets +X/+0 until end of turn, where X is this creature's power."
Ouroboroid79%
$33.75↑#1535↑1.33↑1.2 years↓
"At the beginning of combat on your turn, put X +1/+1 counters on each creature you control, where X is this creature's power."
Attended Socialite78%
$0.13↓#23977↓0.00↓4.5 years
"Whenever another creature you control enters, this creature gets +1/+1 until end of turn."
Loporrit Scout78%
$0.12↓#18974↓0.00↓1.4 years↓
"Whenever another creature you control enters, this creature gets +1/+1 until end of turn."
Mutant Town Musicians78%
$0.07↓#25291↓0.210.6 years↓
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
+1 more matching line
Crossroads Watcher78%
$0.13↓#19487↓0.150.7 years↓
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
+1 more matching line
Llanowar Stalker78%
$0.15↓#22852↓0.06↓4.1 years
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
Beast-Kin Ranger78%
$0.19↓#15328↓0.05↓1.9 years↓
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
Herd Gnarr78%
$0.09↓#31509↓0.05↓21.2 years↑
"Whenever another creature you control enters, this creature gets +2/+2 until end of turn."
Reckless Amplimancer78%
$0.10↓#23882↓0.05↓5.5 years↑
"
: Double this creature's power and toughness until end of turn."
: Double this creature's power and toughness until end of turn."
Bronzebeak Moa78%
$0.05↓#25082↓0.05↓13.5 years↑
"Whenever another creature you control enters, this creature gets +3/+3 until end of turn."
Griffin Protector77%
$0.09↓#21601↓0.00↓14.3 years↑
"Whenever another creature you control enters, this creature gets +1/+1 until end of turn."
East Wind Avatar77%
$0.09↓#24614↓0.07↓0.6 years↓
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
Mr. Orfeo, the Boulder76%
$0.23↓#7948↓0.06↓4.5 years
"Whenever you attack, double target creature's power until end of turn."