Voice of the Vermin 
Creature — Human Citizen
$0.15 #28215 0.14 4.5 years
This creature enters with a shield counter on it. (If it would be dealt damage or destroyed, remove a shield counter from it instead.)
Whenever this creature attacks, target creature you control has base power and toughness 4/4 until end of turn.
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Cards similar to Voice of the Vermin 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.
Gnottvold Hermit // Chrome Host Hulk94%
$0.09↓#295010.00↓3.5 years
"Whenever this creature attacks, up to one other target creature has base power and toughness 5/5 until end of turn."
Dapper Shieldmate94%
$0.04↓#280770.00↓4.5 years
"This creature enters with a shield counter on it."
Disciplined Duelist94%
$0.11↓#231950.124.5 years
"This creature enters with a shield counter on it."
Swooping Protector93%
$0.04↓#248080.064.5 years
"This creature enters with a shield counter on it."
Wingshield Agent90%
$0.07↓#264240.124.5 years
"This creature enters with a shield counter on it."
+1 more matching line
Creepy Puppeteer88%
$0.17↑#260080.00↓4.9 years
"Whenever this creature attacks, if you attacked with exactly one other creature this combat, you may have that creature's base power and toughness become 4/3 until end of turn."
Rhox Pummeler87%
$0.06↓#253150.214.5 years
"This creature enters with a shield counter on it."
Unruly Krasis84%
$0.38↑#22363↑0.112.7 years↓
"Whenever this creature attacks, you may have the base power and toughness of another target creature you control become X/X until end of turn, where X is this creature's power."
Gigantomancer81%
$0.40↑#21075↑0.0616.5 years↑
"
: Target creature you control has base power and toughness 7/7 until end of turn."
: Target creature you control has base power and toughness 7/7 until end of turn."
Rigo, Streetwise Mentor80%
$0.25↑#14274↑0.00↓4.5 years
"this card enters with a shield counter on it."
Taranika, Akroan Veteran79%
$0.25↑#15578↑0.146.7 years↑
"Whenever this card attacks, untap another target creature you control. Until end of turn, that creature has base power and toughness 4/4 and gains indestructible."
Restless Vinestalk78%
$0.35↑#5974↑0.063.1 years↓
"Whenever this land attacks, up to one other target creature has base power and toughness 3/3 until end of turn."
Galion, Elvenking's Butler78%
$0.16↑#20514↑0.100.2 years↓
"Whenever this card attacks, choose up to one other target creature you control. Its base power and toughness become equal to this card's power and toughness until end of turn."
Sanctuary Warden78%
$1.33↑#7846↑0.00↓4.5 years
"This creature enters with two shield counters on it."
Burrenton Shield-Bearers78%
$0.19↑#303510.0618.7 years↑
"Whenever this creature attacks, target creature gets +0/+3 until end of turn."
Falco Spara, Pactweaver77%
$2.50↑#7108↑0.31↑4.5 years
"this card enters with a shield counter on it."
Perrie, the Pulverizer77%
$0.20↑#16772↑0.33↑4.5 years
"When this card enters, put a shield counter on target creature."
+1 more matching line
Captain America, Super-Soldier76%
$2.69↑#10368↑0.40↑0.3 years↓
"this card enters with a shield counter on him."
Diamond City76%
$2.92↑#3170↑0.28↑2.6 years↓
"This land enters with a shield counter on it."
Valakut Fireboar76%
$0.19↑#278000.00↓16.5 years↑
"Whenever this creature attacks, switch its power and toughness until end of turn."