Power Fist 
Artifact — Equipment
$14.86 #1798 0.43 2.5 years
Equipped creature has trample and "Whenever this creature deals combat damage to a player, put that many +1/+1 counters on it."
Equip 
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Cards similar to Power Fist 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.
Necropolis Regent86%
$0.40↓#4062↓0.21↓13.9 years↑
"Whenever a creature you control deals combat damage to a player, put that many +1/+1 counters on it."
Conclave Sledge-Captain85%
$2.01↓#7450↓0.25↓3.4 years
"Whenever this creature deals combat damage to a player, put that many +1/+1 counters on it."
Westgate Regent83%
$0.26↓#13702↓0.385.1 years↑
"Whenever this creature deals combat damage to a player, put that many +1/+1 counters on it."
Curse of Stalked Prey76%
$0.85↓#12394↓0.26↓14.9 years↑
"Whenever a creature deals combat damage to enchanted player, put a +1/+1 counter on that creature."
Falkenrath Marauders76%
$0.26↓#16087↓0.20↓14.9 years↑
"Whenever this creature deals combat damage to a player, put two +1/+1 counters on it."
Slith Predator76%
$0.11↓#28916↓0.00↓22.9 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Firewalker76%
$0.10↓#28099↓0.24↓22.9 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Markov Blademaster76%
$0.30↓#13465↓0.10↓14.6 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Erdwal Ripper76%
$0.21↓#25520↓0.06↓14.6 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Stromkirk Patrol76%
$0.08↓#27363↓0.27↓14.9 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Aveline de Grandpré76%
$0.37↓#7394↓0.412.2 years
"Whenever a creature you control with deathtouch deals combat damage to a player, put that many +1/+1 counters on that creature."
Sphere Grid76%
$8.73↓#1299↑0.461.2 years↓
"Whenever a creature you control deals combat damage to a player, put a +1/+1 counter on that creature."
Slith Ascendant76%
$0.09↓#25038↓0.29↓22.9 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Heirs of Stromkirk76%
$0.13↓#23805↓0.25↓14.3 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Buster Sword74%
$52.70↑#914↑0.96↑1.2 years↓
"Equip "
"
Havengul Vampire74%
$0.14↓#21336↓0.25↓14.3 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Briar Hydra74%
$0.30↓#12871↓0.384.0 years↑
"Whenever this creature deals combat damage to a player, put X +1/+1 counters on target creature you control, where X is the number of basic land types among lands you control."
The Key to the Vault74%
$0.37↓#2165↓0.23↓2.4 years
"Equip 
"
"
Glamdring74%
$3.27↓#5557↓0.363.2 years
"Equip 
"
"
Junk Jet73%
$0.33↓#9539↓0.382.5 years
"Equip "
"