Electrostatic Pummeler 
Artifact Creature — Construct
When this creature enters, you get {E}{E}{E} (three energy counters).
Pay {E}{E}{E}: This creature gets +X/+X until end of turn, where X is its power.
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Cards that do something similar expected a card that isn't here?
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Bristling Hydra 85%
$0.14#17731
"Pay {E}{E}{E}: Put a +1/+1 counter on this creature. It gains hexproof until end of turn."
+1 more matching line
Thriving Skyclaw 100%
$0.16#20424
"When this creature enters, you get {E}{E}{E} ."
+1 more matching line
Riddle Gate Gargoyle 100%
$0.28#11013
"When this creature enters, you get {E}{E}{E} ."
+1 more matching line
Emissary of Soulfire 100%
$0.14#18072
"When this creature enters, you get {E}{E}{E} ."
+1 more matching line
Aether Theorist 100%
$0.15#16788
"When this creature enters, you get {E}{E}{E} ."
+1 more matching line
Multiform Wonder 100%
$0.23#19044
"When this creature enters, you get {E}{E}{E} ."
+1 more matching line
Voltstorm Angel 100%
$0.17#19667
"When this creature enters, you get {E}{E}{E} ."
+1 more matching line
Whirler Virtuoso 100%
$0.27#5759
"When this creature enters, you get {E}{E}{E} ."
+1 more matching line
Aethertorch Renegade 98%
$0.15#17127
"When this creature enters, you get {E}{E}{E}{E} ."
+1 more matching line
Shipwreck Moray 98%
$0.09#24919
"When this creature enters, you get {E}{E}{E}{E} ."
+1 more matching line
Hightide Hermit 98%
$0.07#22259
"When this creature enters, you get {E}{E}{E}{E} ."
+1 more matching line
Consul's Shieldguard 89%
$0.04#25444
"When this creature enters, you get {E}{E} ."
+1 more matching line