Trail of Mystery 
Enchantment
$0.11 #6121 0.07 12.1 years
Whenever a face-down creature you control enters, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle.
Whenever a permanent you control is turned face up, if it's a creature, it gets +2/+2 until end of turn.
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Cards similar to Trail of Mystery expected a card that isn't here?
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Secret Plans82%
$0.21↑#9200↓0.0612.1 years
"Whenever a permanent you control is turned face up, draw a card."
Cryptid Inspector81%
$0.15↑#17640↓0.062.1 years↓
"Whenever a face-down permanent you control enters and whenever this creature or another permanent you control is turned face up, put a +1/+1 counter on this creature."
Sumala Sentry79%
$0.09↓#23669↓0.122.7 years↓
"Whenever a face-down permanent you control is turned face up, put a +1/+1 counter on it and a +1/+1 counter on this creature."
Aven Farseer78%
$0.08↓#29968↓0.0023.4 years↑
"Whenever a permanent is turned face up, put a +1/+1 counter on this creature."
Salt Road Ambushers78%
$0.10↓#12468↓0.0011.6 years
"Whenever another permanent you control is turned face up, if it's a creature, put two +1/+1 counters on it."
Growing Dread77%
$0.21↑#11469↓0.22↑2.1 years↓
"Whenever you turn a permanent face up, put a +1/+1 counter on it."
Threats Around Every Corner76%
$0.28↑#60190.102.1 years↓
"Whenever a face-down permanent you control enters, search your library for a basic land card, put it onto the battlefield tapped, then shuffle."
Aphetto Runecaster76%
$0.35↑#16479↓0.0023.4 years↑
"Whenever a permanent is turned face up, you may draw a card."
Mastery of the Unseen76%
$0.13↑#16958↓0.1111.8 years
"Whenever a permanent you control is turned face up, you gain 1 life for each creature you control."
Environmental Scientist76%
$0.23↑#16301↓0.080.5 years↓
"When this creature enters, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle."
Civic Wayfinder76%
$0.06↓#19158↓0.0021.0 years↑
"When this creature enters, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle."
Skittering Surveyor76%
$0.06↓#12349↓0.008.5 years↓
"When this creature enters, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle."
Farfinder76%
$0.26↑#15461↓0.006.5 years↓
"When this creature enters, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle."
Sylvan Ranger76%
$0.17↑#9506↓0.25↑16.3 years↑
"When this creature enters, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle."
Borderland Ranger76%
$0.09↓#18409↓0.1017.3 years↑
"When this creature enters, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle."
Pilgrim's Eye75%
$0.04↓#49690.0716.7 years↑
"When this creature enters, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle."
Journeyer's Kite74%
$0.17↑#16678↓0.17↑22.1 years↑
"
, 
: Search your library for a basic land card, reveal it, put it into your hand, then shuffle."
, : Search your library for a basic land card, reveal it, put it into your hand, then shuffle."
Lay of the Land73%
$0.05↓#13471↓0.0025.4 years↑
"Search your library for a basic land card, reveal it, put it into your hand, then shuffle."
Panoptic Projektor72%
$0.31↑#9442↓0.062.7 years↓
"If turning a face-down permanent face up causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time."
Seek the Horizon72%
$0.19↑#11390↓0.0021.4 years↑
"Search your library for up to three basic land cards, reveal them, put them into your hand, then shuffle."