Drowned Secrets 

Enchantment
$0.48 #8491 0.86 7.9 years
Whenever you cast a blue spell, target player mills two cards.
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Drowner Initiate89%
$0.28↓#22330↓0.38↓18.3 years↑
"Whenever a player casts a blue spell, you may pay
. If you do, target player mills two cards."
Sage's Row Denizen88%
$0.08↓#17942↓0.15↓13.6 years↑
"Whenever another blue creature you control enters, target player mills two cards."
Diligent Excavator82%
$0.27↓#18230↓0.33↓8.4 years
"Whenever you cast a historic spell, target player mills two cards."
Merrow Witsniper79%
$0.26↓#26272↓0.53↓18.6 years↑
"When this creature enters, target player mills a card."
Returned Centaur78%
$0.04↓#21302↓0.11↓12.9 years↑
"When this creature enters, target player mills four cards."
Homarid Explorer78%
$0.08↓#24051↓0.71↓8.4 years
"When this creature enters, target player mills four cards."
Jace's Erasure77%
$0.30↓#77190.27↓16.1 years↑
"Whenever you draw a card, you may have target player mill a card."
Circu, Dimir Lobotomist77%
$0.40↓#18101↓0.27↓20.9 years↑
"Whenever you cast a blue spell, exile the top card of target player's library."
Selhoff Occultist76%
$0.07↓#21436↓0.21↓14.9 years↑
"Whenever this creature or another creature dies, target player mills a card."
Desperate Bloodseeker75%
$0.19↓#14392↓0.00↓2.4 years↓
"When this creature enters, target player mills two cards."
Wall of Lost Thoughts75%
$0.21↓#13972↓0.27↓7.6 years
"When this creature enters, target player mills four cards."