Tireless Tracker 
Creature — Human Scout
$0.24 #668 0.25 10.5 years
Landfall — Whenever a land you control enters, investigate. (Create a Clue token. It's an artifact with ", Sacrifice this token: Draw a card.")
, Sacrifice this token: Draw a card.")Whenever you sacrifice a Clue, put a +1/+1 counter on this creature.
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Lonis, Genetics Expert92%
$5.39↑#11221↓0.07↓2.7 years↓
"Whenever you sacrifice a Clue, put a +1/+1 counter on another target creature you control."
Piper Wright, Publick Reporter90%
$0.35↑#6423↓0.11↓2.6 years↓
"Whenever you sacrifice a Clue, put a +1/+1 counter on target creature you control."
Thorough Investigation88%
$2.27↑#7219↓0.47↑5.2 years↓
"Whenever you sacrifice a Clue, venture into the dungeon."
+1 more matching line
Daring Sleuth // Bearer of Overwhelming Truths88%
$0.06↓#19429↓0.06↓10.5 years
"When you sacrifice a Clue, transform this creature."
Ulvenwald Mysteries86%
$0.07↓#7896↓0.12↓10.5 years
"Whenever you sacrifice a Clue, create a 1/1 white Human Soldier creature token."
Havengul Laboratory // Havengul Mystery84%
$0.59↑#9224↓0.235.0 years↓
"At the beginning of your end step, if you sacrificed three or more Clues this turn, transform this card."
Graf Mole83%
$0.04↓#15432↓0.1610.5 years
"Whenever you sacrifice a Clue, you gain 3 life."
Bloodbriar80%
$0.04↓#19492↓0.2110.2 years
"Whenever you sacrifice another permanent, put a +1/+1 counter on this creature."
Gixian Infiltrator80%
$0.25↑#17047↓0.00↓3.9 years↓
"Whenever you sacrifice another permanent, put a +1/+1 counter on this creature."
Pirate Peddlers80%
$0.15↓#14647↓0.190.9 years↓
"Whenever you sacrifice another permanent, put a +1/+1 counter on this creature."
Briarbridge Patrol80%
$0.17↓#17669↓0.00↓10.5 years
"At the beginning of each end step, if you sacrificed three or more Clues this turn, you may put a creature card from your hand onto the battlefield."
Persuasive Interrogators78%
$0.19↓#12538↓0.60↑2.7 years↓
"Whenever you sacrifice a Clue, target opponent gets two poison counters."
+1 more matching line
Jenny Flint77%
$0.25↑#16159↓0.40↑3.0 years↓
"Whenever you sacrifice a Clue or Food, put a +1/+1 counter on another target creature you control."
Tatyova, Benthic Druid76%
$0.21↓#483↑0.87↑8.5 years↓
"Whenever a land you control enters, you gain 1 life and draw a card."
Seer's Sundial76%
$0.15↓#4427↓0.10↓16.7 years↑
"Whenever a land you control enters, you may pay . If you do, draw a card."
. If you do, draw a card."
Lonis, Cryptozoologist75%
$0.28↑#5284↓0.40↑5.5 years↓
"Whenever another nontoken creature you control enters, investigate."
Gandalf, Shadow's Foe74%
$22.48↑#13755↓0.310.2 years↓
"Whenever a land you control enters, draw a card and put a +1/+1 counter on this card."
Evolution Sage74%
$2.17↑#401↑0.59↑7.5 years↓
"Whenever a land you control enters, proliferate."
Sazh's Chocobo74%
$0.51↑#2990↓0.44↑1.4 years↓
"Whenever a land you control enters, put a +1/+1 counter on this creature."
Vinelasher Kudzu74%
$0.35↑#13535↓0.00↓21.0 years↑
"Whenever a land you control enters, put a +1/+1 counter on this creature."