Clockwork Dragon 
Artifact Creature — Dragon
Flying
This creature enters with six +1/+1 counters on it.
Whenever this creature attacks or blocks, remove a +1/+1 counter from it at end of combat.
{3}: Put a +1/+1 counter on this creature.
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Cards that do something similar expected a card that isn't here?
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Spike Hatcher 100%
#28666
"This creature enters with six +1/+1 counters on it."
+1 more matching line
Clockwork Vorrac 100%
$0.11#24569
"Whenever this creature attacks or blocks, remove a +1/+1 counter from it at end of combat."
+2 more matching lines
Clockwork Beetle 100%
$0.13#19651
"Whenever this creature attacks or blocks, remove a +1/+1 counter from it at end of combat."
+1 more matching line
Clockwork Condor 100%
$0.25#25889
"Whenever this creature attacks or blocks, remove a +1/+1 counter from it at end of combat."
+1 more matching line
Feral Hydra 99%
$0.37#9365
"{3}: Put a +1/+1 counter on this creature. Any player may activate this ability."
+1 more matching line
Intrepid Tenderfoot 98%
$0.10#22318
"{3}: Put a +1/+1 counter on this creature. Activate only as a sorcery."
Marketback Walker 98%
$0.73#4166
"{4}: Put a +1/+1 counter on this creature."
+2 more matching lines
Savage Firecat 97%
$0.33#30380
"This creature enters with seven +1/+1 counters on it."
+1 more matching line
Clockwork Beast 97%
#27859
"This creature enters with seven +1/+0 counters on it."
+1 more matching line
Pentavus 95%
$0.26#10624
"This creature enters with five +1/+1 counters on it."
+1 more matching line