Hercules, Olympian Hero 
Legendary Creature — Demigod Warrior Hero
$0.29 #16046 0.00 0.2 years
Whenever Hercules attacks, put a +1/+1 counter on him. He gains indestructible until end of turn.
Whenever Hercules is dealt damage for the first time each turn, put that many +1/+1 counters on him. (He must survive the damage to get the counters.)
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Cards similar to Hercules, Olympian Hero 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.
Mockingbird, Bobbi Morse96%
$0.19↓#29045↓0.000.2 years
"Whenever this card is dealt damage, put a +1/+1 counter on her."
Snapping Sailback96%
$0.19↓#144690.29↑8.9 years↑
"Whenever this creature is dealt damage, put a +1/+1 counter on it."
Siegehorn Ceratops94%
$0.57↑#129680.058.6 years↑
"Whenever this creature is dealt damage, put two +1/+1 counters on it."
Hungering Hydra92%
$2.63↑#3588↑0.31↑8.1 years↑
"Whenever this creature is dealt damage, put that many +1/+1 counters on it."
Rite of Passage92%
$4.80↑#5771↑0.0522.3 years↑
"Whenever a creature you control is dealt damage, put a +1/+1 counter on it."
Venus, Torn Between Worlds91%
$0.21↓#163330.000.5 years
"Whenever this card is dealt damage, put that many +1/+1 counters on her."
Fungusaur88%
$0.25↓#23468↓0.31↑33.1 years↑
"Whenever this creature is dealt damage, put a +1/+1 counter on it."
Estwald Shieldbasher86%
$0.10↓#25343↓0.86↑4.8 years↑
"Whenever this creature attacks, you may pay 
. If you do, it gains indestructible until end of turn."
. If you do, it gains indestructible until end of turn."
Strong, the Brutish Thespian85%
$0.36↑#6137↑0.21↑2.5 years↑
"Whenever this card is dealt damage, you get three rad counters and put three +1/+1 counters on this card."
Luke Cage, Power Man80%
$0.17↓#22076↓0.000.2 years
"Whenever this card attacks alone, he gets +2/+0 and gains indestructible until end of turn."
War Elemental78%
$5.01↑#133190.14↑22.9 years↑
"Whenever an opponent is dealt damage, put that many +1/+1 counters on this creature."
Weathered Sentinels77%
$0.97↑#2853↑0.25↑4.4 years↑
"Whenever this creature attacks, it gets +3/+3 and gains indestructible until end of turn."
Primaris Chaplain76%
$0.34↑#153080.47↑3.9 years↑
"Whenever this creature attacks, it gains indestructible until end of turn."
Rubblebelt Raiders75%
$0.13↓#184400.31↑13.6 years↑
"Whenever this creature attacks, put a +1/+1 counter on it for each attacking creature you control."
Fungus Sliver75%
$0.49↑#133660.33↑19.9 years↑
"All Sliver creatures have "Whenever this creature is dealt damage, put a +1/+1 counter on it.""
Resplendent Griffin74%
$0.13↓#28436↓0.008.6 years↑
"Whenever this creature attacks, if you have the city's blessing, put a +1/+1 counter on it."
Voice of the Blessed73%
$1.96↑#3108↑0.33↑4.8 years↑
"As long as this creature has ten or more +1/+1 counters on it, it has indestructible."
+1 more matching line
Ezio, Brash Novice73%
$0.19↓#12528↑0.76↑2.2 years↑
"Whenever this card attacks, put a +1/+1 counter on it."
Rushwood Elemental72%
$0.98↑#28048↓0.25↑26.9 years↑
"At the beginning of your upkeep, you may put a +1/+1 counter on this creature."
War Historian72%
$0.03↓#30007↓0.47↑3.4 years↑
"This creature has indestructible as long as it attacked a battle this turn."