Overclocked Electromancer 

Creature — Lizard Wizard
$0.25 #11588 0.06 2.3 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%
$0.25#23758↓0.069.7 years↑
"Whenever this creature attacks, you may pay 
. If you do, put a +1/+1 counter on it."
Thriving Skyclaw92%
$0.16↓#21433↓0.25↑2.3 years
"Whenever this creature attacks, you may pay 

. If you do, put a +1/+1 counter on it."
Thriving Rhino90%
$0.07↓#26902↓0.0010.1 years↑
"Whenever this creature attacks, you may pay 
. If you do, put a +1/+1 counter on it."
Thriving Turtle90%
$0.06↓#20783↓0.0510.1 years↑
"Whenever this creature attacks, you may pay 
. If you do, put a +1/+1 counter on it."
Thriving Ibex90%
$0.04↓#27679↓0.25↑10.1 years↑
"Whenever this creature attacks, you may pay 
. If you do, put a +1/+1 counter on it."
Thriving Grubs90%
$0.04↓#26397↓0.29↑10.1 years↑
"Whenever this creature attacks, you may pay 
. If you do, put a +1/+1 counter on it."
Thriving Rats90%
$0.10↓#24627↓0.0010.1 years↑
"Whenever this creature attacks, you may pay 
. If you do, put a +1/+1 counter on it."
Rampaging Aetherhood89%
$0.27↑#8459↑0.121.7 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%
$0.22↓#104670.29↑2.6 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↓#27222↓0.119.7 years↑
"Whenever this creature attacks, you may pay
. If you do, it gets +2/+0 until end of turn."
Riparian Tiger86%
$0.09↓#27738↓0.17↑10.1 years↑
"Whenever this creature attacks, you may pay 
. If you do, it gets +2/+2 until end of turn."
Longtusk Cub84%
$0.21↓#21057↓0.0710.1 years↑
"Pay 
: Put a +1/+1 counter on this creature."
+1 more matching line
Grunn, the Lonely King84%
$0.17↓#9100↑0.008.5 years↑
"Whenever this card attacks alone, double its power and toughness until end of turn."
War-Trained Slasher84%
$0.17↓#25134↓0.113.5 years↑
"Whenever this creature attacks a battle, double its power until end of turn."
Aetherstorm Roc83%
$0.25#8303↑0.33↑10.1 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%
$0.16↓#18387↓0.0810.1 years↑
"Pay 

: Put a +1/+1 counter on this creature. It gains hexproof until end of turn."
Voltaic Brawler82%
$0.17↓#28297↓0.0710.1 years↑
"When this creature enters, you get 
."
+1 more matching line