Devilish Valet 
Creature — Devil Warrior
$0.33 #3426 0.38 4.4 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%
$2.82↑#2725↑1.10↑1.7 years↓
"Whenever a land you control enters, double this card's power until end of turn."
Nylea's Colossus87%
$5.07↑#7219↓0.82↑8.1 years↑
"Whenever this creature or another enchantment you control enters, double target creature's power and toughness until end of turn."
Railway Brawler85%
$5.84↑#2492↑0.362.4 years↓
"Whenever another creature you control enters, put X +1/+1 counters on it, where X is its power."
Mightform Harmonizer84%
$2.17↑#32290.411.1 years↓
"Whenever a land you control enters, double the power of target creature you control until end of turn."
Madame Null, Power Broker83%
$0.38↑#10226↓0.00↓0.5 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%
$0.18↓#11699↓0.19↓2.1 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."
Ouroboroid80%
$34.16↑#1642↑0.63↑1.1 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%
$0.07↓#23744↓0.05↓4.4 years
"Whenever another creature you control enters, this creature gets +1/+1 until end of turn."
Loporrit Scout78%
$0.14↓#19003↓0.311.2 years↓
"Whenever another creature you control enters, this creature gets +1/+1 until end of turn."
Beast-Kin Ranger78%
$0.09↓#15253↓0.15↓1.8 years↓
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
+1 more matching line
Crossroads Watcher78%
$0.11↓#19495↓0.00↓0.6 years↓
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
Mutant Town Musicians78%
$0.08↓#25590↓0.00↓0.5 years↓
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
+1 more matching line
Llanowar Stalker78%
$0.16↓#22410↓0.00↓4.0 years
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
Herd Gnarr78%
$0.08↓#31157↓0.50↑21.0 years↑
"Whenever another creature you control enters, this creature gets +2/+2 until end of turn."
Reckless Amplimancer78%
$0.08↓#23728↓0.22↓5.4 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↓#24788↓0.4313.3 years↑
"Whenever another creature you control enters, this creature gets +3/+3 until end of turn."
Griffin Protector77%
$0.08↓#21281↓0.25↓14.1 years↑
"Whenever another creature you control enters, this creature gets +1/+1 until end of turn."
East Wind Avatar77%
$0.10↓#24888↓0.00↓0.5 years↓
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
Mr. Orfeo, the Boulder76%
$0.22↓#7784↓0.26↓4.4 years
"Whenever you attack, double target creature's power until end of turn."
Nantuko Mentor75%
$0.36↑#23433↓0.23↓24.9 years↑
", 
: Target creature gets +X/+X until end of turn, where X is that creature's power."
, : Target creature gets +X/+X until end of turn, where X is that creature's power."