Drowned Secrets 

Enchantment
$0.63 #8669 0.51 8.0 years
Whenever you cast a blue spell, target player mills two cards.
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Drowner Initiate89%
$0.27↓#22627↓0.11↓18.5 years↑
"Whenever a player casts a blue spell, you may pay
. If you do, target player mills two cards."
Sage's Row Denizen88%
$0.10↓#18306↓0.4413.7 years↑
"Whenever another blue creature you control enters, target player mills two cards."
Diligent Excavator82%
$0.32↓#18509↓0.41↓8.5 years
"Whenever you cast a historic spell, target player mills two cards."
Merrow Witsniper79%
$0.28↓#26503↓0.18↓18.7 years↑
"When this creature enters, target player mills a card."
Returned Centaur78%
$0.05↓#21613↓0.19↓13.1 years↑
"When this creature enters, target player mills four cards."
Homarid Explorer78%
$0.08↓#24305↓0.07↓8.5 years
"When this creature enters, target player mills four cards."
Jace's Erasure77%
$0.26↓#76470.20↓16.3 years↑
"Whenever you draw a card, you may have target player mill a card."
Circu, Dimir Lobotomist77%
$0.41↓#17878↓0.39↓21.0 years↑
"Whenever you cast a blue spell, exile the top card of target player's library."
Selhoff Occultist76%
$0.07↓#21824↓0.26↓15.1 years↑
"Whenever this creature or another creature dies, target player mills a card."
Desperate Bloodseeker75%
$0.21↓#14650↓0.05↓2.5 years↓
"When this creature enters, target player mills two cards."
Wall of Lost Thoughts75%
$0.17↓#14226↓0.25↓7.7 years
"When this creature enters, target player mills four cards."