Overclocked Electromancer {2}{R}
Creature — Lizard Wizard
At the beginning of combat on your turn, you may pay {E}{E}{E}. If you do, put a +1/+1 counter on this creature.
Whenever this creature attacks, double its power until end of turn.
Whenever this creature deals combat damage to a creature, if that creature was dealt excess damage this turn, you get X {E}, where X is that excess damage.
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Cards that do something similar expected a card that isn't here?
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War-Trained Slasher 92%
$0.13#24247
"Whenever this creature attacks a battle, double its power until end of turn."
Aurora Shifter 87%
$0.44#7400
"Whenever this creature deals combat damage to a player, you get that many {E}."
+1 more matching line
Empyreal Voyager 87%
$0.09#18270
"Whenever this creature deals combat damage to a player, you get that many {E} ."
Peema Trailblazer 87%
$0.22#9817
"Whenever this creature deals combat damage to a player, you get that many {E} ."
Momentum Rumbler 85%
$0.26#21905
"Whenever this creature attacks, if it has first strike, it gains double strike until end of turn."
Death Kiss 84%
$4.35#4477
"Whenever a creature an opponent controls attacks one of your opponents, double its power until end of turn."
Picnic Ruiner // Stolen Goodies 82%
$0.15#14988
"Whenever this creature attacks while you control a creature with power 4 or greater, this creature gains double strike until end of turn."
Two-Handed Axe // Sweeping Cleave 82%
$1.62#2285
"Whenever equipped creature attacks, double its power until end of turn."
Creepy Puppeteer 81%
$0.19#25029
"Whenever this creature attacks, if you attacked with exactly one other creature this combat, you may have that creature's base power and toughness become 4/3 until end of turn."
Ogre Marauder 80%
$0.25#24804
"Whenever this creature attacks, it gains "this creature can't be blocked" until end of turn unless defending player sacrifices a creature of their choice."
Mirror-Style Master 80%
$0.27#12093
"Whenever this creature attacks, for each attacking modified creature you control, create a tapped and attacking token that's a copy of that creature. Exile those tokens at end of combat."