Windborn Muse 

Creature — Spirit
$0.53 #1001 0.91 23.7 years
Flying
Creatures can't attack you unless their controller pays
for each creature they control that's attacking you.
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Cards similar to Windborn Muse 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.
Ghostly Prison95%
$5.67↑#159↑1.29↑22.1 years↓
"Creatures can't attack you unless their controller pays
for each creature they control that's attacking you."
Collective Restraint93%
$12.03↑#6827↓0.9926.0 years↑
"Creatures can't attack you unless their controller pays
for each creature they control that's attacking you, where X is the number of basic land types among lands you control."
Propaganda88%
$1.95↑#111↑1.27↑29.0 years↑
"Creatures can't attack you unless their controller pays
for each creature they control that's attacking you."
War Tax88%
$1.82↑#15786↓0.40↓27.0 years↑
"
: This turn, creatures can't attack unless their controller pays
for each attacking creature they control."
Koskun Falls86%
$17.16↑#10747↓0.79↓31.1 years↑
"Creatures can't attack you unless their controller pays
for each creature they control that's attacking you."
Baird, Steward of Argive83%
$0.23↓#2585↓0.59↓8.5 years↓
"Creatures can't attack you or planeswalkers you control unless their controller pays
for each of those creatures."
Elephant Grass81%
$2.70↑#10310↓0.70↓29.7 years↑
"Nonblack creatures can't attack you unless their controller pays
for each creature they control that's attacking you."
Brainwash81%
$0.12↓#22338↓0.20↓32.2 years↑
"Enchanted creature can't attack unless its controller pays
."
Archon of Absolution80%
$0.17↓#7534↓0.43↓7.0 years↓
"Creatures can't attack you or planeswalkers you control unless their controller pays
for each of those creatures."
+1 more matching line
Sphere of Safety78%
$3.48↑#691↑1.27↑14.0 years↓
"Creatures can't attack you or planeswalkers you control unless their controller pays
for each of those creatures, where X is the number of enchantments you control."
Dáin, Lord of the Iron Hills78%
$0.27↓#8545↓0.44↓0.2 years↓
"As long as you have an enduring story, creatures can't attack you unless their controller pays
for each of those creatures."
Forbidding Spirit78%
$0.17↓#16275↓0.31↓7.7 years↓
"When this creature enters, until your next turn, creatures can't attack you or planeswalkers you control unless their controller pays
for each of those creatures."
Kazuul, Tyrant of the Cliffs77%
$0.16↓#1890↓0.22↓16.7 years↓
"Whenever a creature an opponent controls attacks, if you're the defending player, create a 3/3 red Ogre creature token unless that creature's controller pays
."
Onakke Oathkeeper76%
$10.17↑#6223↓0.65↓3.2 years↓
"Creatures can't attack planeswalkers you control unless their controller pays
for each creature they control that's attacking a planeswalker you control."
Summon: Yojimbo76%
$0.74↑#2294↓0.37↓1.4 years↓
"Until your next turn, creatures can't attack you unless their controller pays
for each of those creatures."
Nils, Discipline Enforcer75%
$0.32↓#3893↓0.21↓5.5 years↓
"Each creature with one or more counters on it can't attack you or planeswalkers you control unless its controller pays
, where X is the number of counters on that creature."
Norn's Annex75%
$4.52↑#1929↓0.8415.4 years↓
"Creatures can't attack you or planeswalkers you control unless their controller pays
for each of those creatures."
Archangel of Tithes74%
$2.23↑#2111↓0.8711.3 years↓
"As long as this creature is attacking, creatures can't block unless their controller pays
for each of those creatures."
Cowed by Wisdom72%
$0.18↓#22022↓0.31↓21.4 years↓
"Enchanted creature can't attack or block unless its controller pays
for each card in your hand."