Overclocked Electromancer 

Creature — Lizard Wizard
$0.23 #11245 0.00 2.2 years
At the beginning of combat on your turn, you may pay 

. 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
, where X is that excess damage.
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Cards similar to Overclocked Electromancer expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Scrapper Champion92%
$0.23#23307↓0.16↑9.6 years↑
"Whenever this creature attacks, you may pay 
. If you do, put a +1/+1 counter on it."
Thriving Skyclaw92%
$0.12↓#21000↓0.002.2 years
"Whenever this creature attacks, you may pay 

. If you do, put a +1/+1 counter on it."
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$0.05↓#26004↓0.22↑9.9 years↑
"Whenever this creature attacks, you may pay 
. If you do, put a +1/+1 counter on it."
Thriving Rats90%
$0.08↓#24249↓0.29↑9.9 years↑
"Whenever this creature attacks, you may pay 
. If you do, put a +1/+1 counter on it."
Thriving Ibex90%
$0.05↓#27283↓0.27↑9.9 years↑
"Whenever this creature attacks, you may pay 
. If you do, put a +1/+1 counter on it."
Thriving Turtle90%
$0.11↓#20385↓0.20↑9.9 years↑
"Whenever this creature attacks, you may pay 
. If you do, put a +1/+1 counter on it."
Thriving Rhino90%
$0.09↓#26540↓0.31↑9.9 years↑
"Whenever this creature attacks, you may pay 
. If you do, put a +1/+1 counter on it."
Rampaging Aetherhood89%
$0.29↑#8572↑0.16↑1.6 years
"At the beginning of your upkeep, you get an amount of
equal to this creature's power. Then you may pay one or more
. If you do, put that many +1/+1 counters on this creature."
Sentry Bot88%
$0.24↑#101710.002.5 years
"At the beginning of combat on your turn, you may pay 

. If you do, put a +1/+1 counter on each creature you control."
Aetherstream Leopard86%
$0.05↓#26939↓0.12↑9.6 years↑
"Whenever this creature attacks, you may pay
. If you do, it gets +2/+0 until end of turn."
Riparian Tiger86%
$0.08↓#27400↓0.009.9 years↑
"Whenever this creature attacks, you may pay 
. If you do, it gets +2/+2 until end of turn."
Grunn, the Lonely King85%
$0.18↓#8937↑0.24↑8.4 years↑
"Whenever this card attacks alone, double its power and toughness until end of turn."
Longtusk Cub84%
$0.17↓#20802↓0.079.9 years↑
"Pay 
: Put a +1/+1 counter on this creature."
+1 more matching line
War-Trained Slasher84%
$0.17↓#24748↓0.27↑3.4 years↑
"Whenever this creature attacks a battle, double its power until end of turn."
Aetherstorm Roc83%
$0.25↑#8074↑0.33↑9.9 years↑
"Whenever this creature attacks, you may pay 
. If you do, put a +1/+1 counter on it and tap up to one target creature defending player controls."
+1 more matching line
Bristling Hydra82%
$0.17↓#18109↓0.30↑9.9 years↑
"Pay 

: Put a +1/+1 counter on this creature. It gains hexproof until end of turn."
Mr. Orfeo, the Boulder82%
$0.22↓#7784↑0.26↑4.4 years↑
"Whenever you attack, double target creature's power until end of turn."