Three Tree Scribe 

Creature — Frog Druid
$0.26 #8464 0.24 2.1 years
Whenever this creature or another creature you control leaves the battlefield without dying, put a +1/+1 counter on target creature you control.
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Imperial Cosmographer96%
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"Whenever another creature you control leaves the battlefield without dying, put two +1/+1 counters on this creature."
Flaming Fist Officer86%
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"Whenever another creature you control leaves the battlefield, put a +1/+1 counter on this creature."
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"Whenever another creature you control leaves the battlefield, put a +1/+1 counter on this creature."
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"Whenever another creature you control leaves the battlefield, if it didn't die, scry 1 and put a +1/+1 counter on this card."
Dour Port-Mage82%
$2.86↑#1508↑0.312.1 years
"Whenever one or more other creatures you control leave the battlefield without dying, draw a card."
Shortcut to Mushrooms78%
$0.17↓#11995↓0.42↑3.2 years↑
"At the beginning of your end step, if a permanent you controlled left the battlefield this turn, put a +1/+1 counter on target creature you control."
Aang, Airbending Master78%
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"Whenever one or more creatures you control leave the battlefield without dying, you get an experience counter."
Leader's Talent74%
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"Whenever a creature you control leaves the battlefield, if it had a counter on it, you gain 2 life."
Solemn Recruit74%
$0.14↓#15802↓0.38↑9.6 years↑
"At the beginning of your end step, if a permanent left the battlefield under your control this turn, put a +1/+1 counter on this creature."
Super Shredder74%
$18.35↑#5469↑0.00↓0.5 years↓
"Whenever another permanent leaves the battlefield, put a +1/+1 counter on this card."
Costume Closet73%
$0.19↓#10577↓0.251.0 years↓
"Whenever a modified creature you control leaves the battlefield, put a +1/+1 counter on this artifact."
Loxodon Battle Priest72%
$0.17↓#18504↓0.03↓1.4 years
"At the beginning of combat on your turn, put a +1/+1 counter on another target creature you control."
Luminarch Aspirant72%
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"At the beginning of combat on your turn, put a +1/+1 counter on target creature you control."
Splinter, the Mentor72%
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"Whenever this card or another nontoken creature you control leaves the battlefield, create a Mutagen token."
Tokka & Rahzar, Unsupervised70%
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"Whenever another nontoken creature you control leaves the battlefield, put a +1/+1 counter on this card and create a Treasure token. This ability triggers only once each turn."
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$0.22↓#19890↓0.00↓4.9 years↑
"Whenever this creature or another creature you control dies, put a +1/+1 counter on target creature you control."