Clockwork Swarm 
Artifact Creature — Insect
$0.15 #29581 0.07 30.9 years
This creature enters with four +1/+0 counters on it.
This creature can't be blocked by Walls.
At end of combat, if this creature attacked or blocked this combat, remove a +1/+0 counter from it.
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Clockwork Avian96%
$0.36↑#285580.40↑32.5 years↑
"
,
: Put up to X +1/+0 counters on this creature. This ability can't cause the total number of +1/+0 counters on this creature to be greater than four. Activate only during your upkeep."
+2 more matching lines
Clockwork Beast95%
$0.33↑#280870.19↑33.1 years↑
"At end of combat, if this creature attacked or blocked this combat, remove a +1/+0 counter from it."
+2 more matching lines
Clockwork Steed88%
$0.13↓#238380.31↑30.9 years
"
,
: Put up to X +1/+0 counters on this creature. This ability can't cause the total number of +1/+0 counters on this creature to be greater than four. Activate only during your upkeep."
+3 more matching lines
Lightning Serpent86%
$3.95↑#19845↑0.47↑20.1 years↓
"This creature enters with X +1/+0 counters on it."
Tower of Coireall86%
$0.84↑#248210.0032.1 years↑
"
: Target creature can't be blocked by Walls this turn."
Kjeldoran Home Guard79%
$0.13↓#302500.0030.2 years
"At end of combat, if this creature attacked or blocked this combat, put a -0/-1 counter on this creature and create a 0/1 white Deserter creature token."
Balduvian Hydra78%
$1.13↑#293580.0031.3 years
"This creature enters with X +1/+0 counters on it."
+2 more matching lines
Kick in the Door74%
$0.19↑#11982↑0.23↑5.1 years↓
"Put a +1/+1 counter on target creature. That creature gains haste until end of turn and can't be blocked by Walls this turn. Venture into the dungeon."
Graaz, Unstoppable Juggernaut74%
$0.35↑#7085↑0.40↑3.6 years↓
"Juggernauts you control can't be blocked by Walls."
Goblin Digging Team74%
$0.11↓#266880.0032.1 years↑
"
, Sacrifice this creature: Destroy target Wall."
Rampart Smasher72%
$0.09↓#301460.35↑6.9 years↓
"This creature can't be blocked by Knights or Walls."
Doorman72%
$0.24↑#285830.000.2 years↓
"
: Until end of turn, target creature can't be blocked by creatures with power 2 or less and/or Walls."