Channeler Initiate 

Creature — Human Druid
When this creature enters, put three -1/-1 counters on target creature you control.
{T}, Remove a -1/-1 counter from this creature: Add one mana of any color.
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Cards that do something similar expected a card that isn't here?
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Exemplar of Strength 100%
$0.22#24130
"When this creature enters, put three -1/-1 counters on target creature you control."
+1 more matching line
Plague Belcher 100%
$0.44#3640
"When this creature enters, put two -1/-1 counters on target creature you control."
Defiant Greatmaw 100%
$0.18#21332
"When this creature enters, put two -1/-1 counters on target creature you control."
+1 more matching line
Soulstinger 100%
$0.11#19198
"When this creature enters, put two -1/-1 counters on target creature you control."
Emptiness 89%
$0.89#13545
"When this creature enters, if {B}{B} was spent to cast it, put three -1/-1 counters on up to one target creature."
Crocodile of the Crossing 87%
$0.09#25630
"When this creature enters, put a -1/-1 counter on target creature you control."
Decimator Beetle 87%
$0.14#17909
"When this creature enters, put a -1/-1 counter on target creature you control."
+1 more matching line
Ornery Kudu 87%
$0.09#29206
"When this creature enters, put a -1/-1 counter on target creature you control."
Baleful Ammit 87%
$0.32#19585
"When this creature enters, put a -1/-1 counter on target creature you control."
Cultbrand Cinder 86%
$0.10#29938
"When this creature enters, put a -1/-1 counter on target creature."
Manticore of the Gauntlet 86%
$0.03#30026
"When this creature enters, put a -1/-1 counter on target creature you control. This creature deals 3 damage to target opponent or planeswalker."