Trail of Mystery 
Enchantment
$0.10 #5739 0.18 11.9 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%
$0.20↑#8656↓0.44↑11.9 years
"Whenever a permanent you control is turned face up, draw a card."
Cryptid Inspector81%
$0.12↑#17216↓0.111.9 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."
Salt Road Ambushers79%
$0.10#11980↓0.75↑11.4 years
"Whenever another permanent you control is turned face up, if it's a creature, put two +1/+1 counters on it."
Sumala Sentry79%
$0.11↑#23164↓0.50↑2.6 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↓#29780↓0.31↑23.3 years↑
"Whenever a permanent is turned face up, put a +1/+1 counter on this creature."
Growing Dread76%
$0.19↑#10758↓0.111.9 years↓
"Whenever you turn a permanent face up, put a +1/+1 counter on it."
Threats Around Every Corner76%
$0.29↑#57500.181.9 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%
$0.33↑#16064↓0.38↑23.3 years↑
"Whenever a permanent is turned face up, you may draw a card."
Mastery of the Unseen76%
$0.14↑#16472↓0.28↑11.6 years
"Whenever a permanent you control is turned face up, you gain 1 life for each creature you control."
Environmental Scientist76%
$0.21↑#16848↓0.00↓0.4 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%
$0.18↑#9244↓0.06↓16.1 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%
$0.03↓#18753↓0.1020.9 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%
$0.05↓#12098↓0.32↑8.4 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%
$0.14↑#18002↓0.2017.1 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↑#15233↓0.00↓6.4 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%
$0.06↓#48500.2416.6 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%
$0.21↑#16325↓0.2521.9 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%
$0.06↓#13287↓0.38↑25.3 years↑
"Search your library for a basic land card, reveal it, put it into your hand, then shuffle."
Panoptic Projektor72%
$0.30↑#9031↓0.62↑2.6 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↑#11174↓0.2121.3 years↑
"Search your library for up to three basic land cards, reveal them, put them into your hand, then shuffle."