Involuntary Cooldown 
Sorcery
$0.18 #18739 0.33 3.8 years
Tap up to two target artifacts and/or creatures. Put two stun counters on each of them. (If a permanent with a stun counter would become untapped, remove one from it instead.)
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Cards similar to Involuntary Cooldown expected a card that isn't here?
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Waylaying Pirates92%
$0.19↑#208450.242.8 years
"When this creature enters, if you control an artifact, tap target artifact or creature an opponent controls and put a stun counter on it."
Mechanozoa90%
$0.13↓#14975↑0.261.1 years↓
"When this creature enters, tap target artifact or creature an opponent controls and put a stun counter on it."
Ice Flan90%
$0.19↑#150730.20↓1.2 years↓
"When this creature enters, tap target artifact or creature an opponent controls. Put a stun counter on it."
Succumb to the Cold88%
$0.25↑#10555↑0.14↓3.0 years
"Tap one or two target creatures an opponent controls. Put a stun counter on each of them."
Lodestone Needle // Guidestone Compass87%
$0.25↑#14345↑0.65↑2.8 years
"When this artifact enters, tap up to one target artifact or creature and put two stun counters on it."
Invasion of Kamigawa // Rooftop Saboteurs86%
$0.21↑#177990.21↓3.4 years
"When this Siege enters, tap target artifact or creature an opponent controls and put a stun counter on it."
Donatello, Rad Scientist84%
$0.38↑#189600.00↓0.5 years↓
"When this card enters, tap up to three target creatures your opponents control. Put a stun counter on each of them."
Tranquilize84%
$0.17↓#13061↑0.57↑2.2 years↓
"Tap target creature an opponent controls and put three stun counters on it."
Stunning Shot84%
$0.29↑#28128↓0.00↓0.2 years↓
"Put two +1/+1 counters on up to one target creature you control. Tap up to one target creature an opponent controls and put a stun counter on it."
Decision Paralysis84%
$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 Breath84%
$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."
Procrastinate83%
$0.20↑#13400↑0.00↓0.4 years↓
"Tap target creature. Put twice X stun counters on it."
Berg Strider80%
$0.12↓#164480.255.6 years↑
"When this creature enters, tap target artifact or creature an opponent controls. If 
was spent to cast this spell, that permanent doesn't untap during its controller's next untap step."
was spent to cast this spell, that permanent doesn't untap during its controller's next untap step."
Wicked Slumber80%
$0.11↓#153530.06↓3.4 years
"Tap up to two target creatures. Put a stun counter on either of them. Then put a stun counter on either of them."
Rime Chill78%
$0.12↓#220290.00↓0.6 years↓
"Tap up to two target creatures. Put a stun counter on each of them."
Crashing Wave78%
$0.21↑#8568↑0.00↓0.8 years↓
"Tap up to X target creatures, then distribute three stun counters among any number of tapped creatures your opponents control."
Frostveil Ambush78%
$0.13↓#206760.12↓6.4 years↑
"Tap up to two target creatures. Those creatures don't untap during their controller's next untap step."
Homesickness78%
$0.17↓#211700.00↓0.4 years↓
"Target player draws two cards. Tap up to two target creatures. Put a stun counter on each of them."
Utrom Scientists78%
$0.13↓#221620.00↓0.5 years↓
"When this creature enters, tap up to one target creature and put a stun counter on it."
Mental Modulation78%
$0.15↓#11548↑0.08↓1.1 years↓
"Tap target artifact or creature."