Clockwork Vorrac 
Artifact Creature — Boar Beast
Trample
This creature enters with four +1/+1 counters on it.
Whenever this creature attacks or blocks, remove a +1/+1 counter from it at end of combat.
{T}: Put a +1/+1 counter on this creature.
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Phantom Nantuko 100%
$0.33#16351
"{T}: Put a +1/+1 counter on this creature."
+2 more matching lines
Clockwork Hydra 100%
$0.25#17128
"{T}: Put a +1/+1 counter on this creature."
+2 more matching lines
Clockwork Dragon 100%
$0.45#20764
"Whenever this creature attacks or blocks, remove a +1/+1 counter from it at end of combat."
+1 more matching line
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
Crystalline Crawler 100%
$0.34#3030
"{T}: Put a +1/+1 counter on this creature."
+1 more matching line
Wildwood Tracker 89%
$0.05#25084
"Whenever this creature attacks or blocks, if you control another non-Human creature, this creature gets +1/+1 until end of turn."
Freelance Muscle 87%
$0.14#17060
"Whenever this creature attacks or blocks, it gets +X/+X until end of turn, where X is the greatest power and/or toughness among other creatures you control."
Burning Sun Cavalry 85%
$0.08#25148
"Whenever this creature attacks or blocks while you control a Dinosaur, this creature gets +1/+1 until end of turn."
Doran, Besieged by Time 82%
$0.61#6359
"Whenever a creature you control attacks or blocks, it gets +X/+X until end of turn, where X is the difference between its power and toughness."
Mana-Charged Dragon 82%
$1.33#18393
"Whenever this creature attacks or blocks, each player starting with you may pay any amount of mana. This creature gets +X/+0 until end of turn, where X is the total amount of mana paid this way."
Kalonian Hydra 100%
$5.82#1096
"This creature enters with four +1/+1 counters on it."
+1 more matching line