Marit Lage's Slumber 

Legendary Snow Enchantment
$0.52 #8870 0.29 7.4 years
Whenever Marit Lage's Slumber or another snow permanent you control enters, scry 1.
At the beginning of your upkeep, if you control ten or more snow permanents, sacrifice Marit Lage's Slumber. If you do, create Marit Lage, a legendary 20/20 black Avatar creature token with flying and indestructible.
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Cards similar to Marit Lage's Slumber expected a card that isn't here?
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Isu the Abominable80%
$3.38↑#18118↓0.00↓3.9 years↓
"Whenever another snow permanent you control enters, you may pay
,
, or
. If you do, put a +1/+1 counter on Isu."
Iceberg Cancrix77%
$0.27↓#12751↓0.287.4 years
"Whenever another snow permanent you control enters, you may have target player mill two cards."
Ruin-Lurker Bat73%
$0.37↓#84710.00↓2.9 years↓
"At the beginning of your end step, if you descended this turn, scry 1."
Political Triumph71%
$0.30↓#13513↓0.14↓0.3 years↓
"Whenever a creature you control enters, scry 1 and put a plan counter on this enchantment."
Contraband Kingpin70%
$0.24↓#15554↓0.53↑10.1 years↑
"Whenever an artifact you control enters, scry 1."