Whimwader 
Creature — Elemental
$0.11 #32181 0.00 18.5 years
This creature can't attack unless defending player controls a blue permanent.
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Cards similar to Whimwader 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.
Bonded Construct84%
$0.04↓#22904↑0.0011.3 years↓
"This creature can't attack alone."
Trusty Companion84%
$0.12↑#313430.11↑10.1 years↓
"This creature can't attack alone."
Raging Kronch84%
$0.03↓#304190.007.5 years↓
"This creature can't attack alone."
Mudbrawler Raiders84%
$0.21↑#314750.11↑18.5 years
"This creature can't be blocked by blue creatures."
Giant Turtle84%
$0.43↑#277760.32↑32.4 years↑
"This creature can't attack if it attacked during your last turn."
Nacatl Outlander82%
$0.13↑#282180.0017.7 years
"Protection from blue"
Yavimaya Barbarian82%
$0.11#299250.0026.0 years↑
"Protection from blue"
Karoo Meerkat82%
$0.16↑#305280.25↑30.0 years↑
"Protection from blue"
Guma82%
$0.28↑#301480.0028.0 years↑
"Protection from blue"
Goblin Cohort78%
$0.20↑#25146↑0.0021.7 years↑
"This creature can't attack unless you've cast a creature spell this turn."
Scragnoth77%
$0.12↑#311680.27↑29.0 years↑
"Protection from blue"
Bloated Toad77%
$0.34↑#19890↑0.0027.7 years↑
"Protection from blue"
Fylamarid77%
$0.21↑#284780.10↑29.0 years↑
"This creature can't be blocked by blue creatures."
Metathran Transport77%
$0.14↑#304180.0626.0 years↑
"This creature can't be blocked by blue creatures."
Phyrexian Marauder77%
$3.45↑#16817↑0.29↑29.7 years↑
"This creature can't attack unless you pay 
for each +1/+1 counter on it."
for each +1/+1 counter on it."
Mogg Jailer77%
$0.13↑#318590.0025.7 years↑
"This creature can't attack if defending player controls an untapped creature with power 2 or less."
Voice of Reason76%
$0.38↑#282890.0527.4 years↑
"Flying, protection from blue"
Windreaper Falcon76%
$0.21↑#317510.0030.0 years↑
"Flying, protection from blue"
Pipsqueak, Rebel Strongarm76%
$0.19↑#269200.15↑0.9 years↓
"this card can't attack alone unless he has a +1/+1 counter on him."
Militia Rallier74%
$0.13↑#265240.004.9 years↓
"This creature can't attack alone."