Wicked Slumber 
Instant
$0.11 #15353 0.06 3.4 years
Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for 
or one mana of that creature's color.)
or one mana of that creature's color.)Tap up to two target creatures. Put a stun counter on either of them. Then put a stun counter on either of them. (If a permanent with a stun counter would become untapped, remove one from it instead.)
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Cards similar to Wicked Slumber 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.
Thunderhead Squadron96%
$0.05↓#27018↓0.64↑3.4 years
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Meeting of Minds96%
$0.17↑#5746↑0.33↑3.4 years
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Succumb to the Cold94%
$0.25↑#10555↑0.143.0 years
"Tap one or two target creatures an opponent controls. Put a stun counter on each of them."
Referee Squad92%
$0.09↓#19170↓0.28↑3.4 years
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
+1 more matching line
Lofty Dreams92%
$0.16↑#19829↓0.000.6 years↓
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Astral Wingspan92%
$0.21↑#151910.093.4 years
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Will-Forged Golem92%
$0.07↓#26050↓0.27↑12.1 years↑
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Halo Hopper92%
$0.25↑#175520.003.4 years
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Transcendent Message92%
$0.36↑#6218↑0.153.4 years
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Decision Paralysis90%
$0.05↓#27142↓0.53↑9.4 years↑
"Tap up to two target creatures. Those creatures don't untap during their controller's next untap step."
Frost Breath90%
$0.11#177370.53↑15.1 years↑
"Tap up to two target creatures. Those creatures don't untap during their controller's next untap step."
Merrow Skyswimmer90%
$0.13↑#21103↓0.000.6 years↓
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Donatello, Rad Scientist90%
$0.38↑#18960↓0.000.5 years↓
"When this card enters, tap up to three target creatures your opponents control. Put a stun counter on each of them."
Tranquilize89%
$0.17↑#130610.57↑2.2 years↓
"Tap target creature an opponent controls and put three stun counters on it."
Procrastinate89%
$0.20↑#134000.000.4 years↓
"Tap target creature. Put twice X stun counters on it."
Harmonized Crescendo89%
$0.49↑#2873↑0.000.6 years↓
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Unexpected Assistance89%
$0.21↑#11330↑0.000.6 years↓
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Vote Out89%
$0.13↑#183740.19↑1.1 years↓
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Temporal Cleansing88%
$0.14↑#127510.133.4 years
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Interdisciplinary Mascot88%
$0.34↑#150510.47↑3.4 years
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."