Hercules, Olympian Hero 
Legendary Creature — Demigod Warrior Hero
$0.30 #15057 0.38 0.3 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%
$0.17↓#28283↓0.26↓0.3 years
"Whenever this card is dealt damage, put a +1/+1 counter on her."
Snapping Sailback96%
$0.19↓#146270.06↓9.1 years↑
"Whenever this creature is dealt damage, put a +1/+1 counter on it."
Siegehorn Ceratops94%
$0.53↑#129720.408.8 years↑
"Whenever this creature is dealt damage, put two +1/+1 counters on it."
Hungering Hydra92%
$2.75↑#3647↑0.14↓8.3 years↑
"Whenever this creature is dealt damage, put that many +1/+1 counters on it."
Rite of Passage92%
$4.95↑#5725↑0.2822.4 years↑
"Whenever a creature you control is dealt damage, put a +1/+1 counter on it."
Venus, Torn Between Worlds91%
$0.26↓#160840.460.6 years
"Whenever this card is dealt damage, put that many +1/+1 counters on her."
Fungusaur88%
$0.31↑#23715↓0.05↓33.2 years↑
"Whenever this creature is dealt damage, put a +1/+1 counter on it."
Estwald Shieldbasher87%
$0.15↓#25774↓0.00↓4.9 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↑#6243↑0.22↓2.6 years↑
"Whenever this card is dealt damage, you get three rad counters and put three +1/+1 counters on this card."
Luke Cage, Power Man81%
$0.15↓#21487↓0.23↓0.3 years
"Whenever this card attacks alone, he gets +2/+0 and gains indestructible until end of turn."
War Elemental78%
$5.18↑#135540.00↓23.0 years↑
"Whenever an opponent is dealt damage, put that many +1/+1 counters on this creature."
Weathered Sentinels77%
$1.04↑#2813↑0.304.5 years↑
"Whenever this creature attacks, it gets +3/+3 and gains indestructible until end of turn."
Bruce Banner // The Incredible Hulk77%
$3.02↑#9417↑0.78↑0.3 years
"Whenever this card is dealt damage, put a +1/+1 counter on him. If he's attacking, untap him and there is an additional combat phase after this phase."
Primaris Chaplain76%
$0.29↓#156480.474.0 years↑
"Whenever this creature attacks, it gains indestructible until end of turn."
Fungus Sliver76%
$0.57↑#134160.2920.0 years↑
"All Sliver creatures have "Whenever this creature is dealt damage, put a +1/+1 counter on it.""
Rubblebelt Raiders74%
$0.13↓#18863↓0.00↓13.7 years↑
"Whenever this creature attacks, put a +1/+1 counter on it for each attacking creature you control."
Resplendent Griffin74%
$0.11↓#28706↓0.00↓8.8 years↑
"Whenever this creature attacks, if you have the city's blessing, put a +1/+1 counter on it."
Voice of the Blessed73%
$0.97↑#2976↑0.16↓4.9 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%
$0.21↓#130120.18↓2.3 years↑
"Whenever this card attacks, put a +1/+1 counter on it."
Leatherhead, Iron Gator73%
$0.28↓#8748↑0.340.6 years
"Whenever this card attacks, put two +1/+1 counters on each creature you control."