Photon, Mighty Marvel 

Legendary Creature — Human Hero
$0.26 #13814 0.35 0.3 years
Flying
Whenever Photon deals combat damage to a player, add that much mana of any one color. Until end of turn, you don't lose this mana as steps and phases end.
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Cards similar to Photon, Mighty Marvel 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.
Mark of Sakiko90%
$2.91↑#117080.2521.7 years↑
"Enchanted creature has "Whenever this creature deals combat damage to a player, add that much
. Until end of turn, you don't lose this mana as steps and phases end.""
Sakiko, Mother of Summer89%
$0.42↑#10507↑0.57↑21.7 years↑
"Whenever a creature you control deals combat damage to a player, add that much
. Until end of turn, you don't lose this mana as steps and phases end."
Raphael, Ninja Destroyer78%
$0.91↑#144110.290.6 years
"Whenever this card is dealt damage, add that much
. Until end of turn, you don't lose this mana as steps and phases end."
Savage Ventmaw77%
$0.39↑#1693↑0.3211.6 years↑
"Whenever this creature attacks, add 




. Until end of turn, you don't lose this mana as steps and phases end."
Black Market76%
$5.13↑#682↑0.52↑27.0 years↑
"At the beginning of your first main phase, add
for each charge counter on this enchantment."
Rapacious One76%
$0.13↓#10545↑0.06↓16.5 years↑
"Whenever this creature deals combat damage to a player, create that many 0/1 colorless Eldrazi Spawn creature tokens. They have "Sacrifice this token: Add
.""
Hoard Robber75%
$0.26#8954↑0.12↓5.2 years↑
"Whenever this creature deals combat damage to a player, create a Treasure token."
Gardenize74%
$1.07↑#143430.400.0 years
"At the beginning of your first main phase, add
for each charge counter on this enchantment."
Grand Warlord Radha73%
$0.77↑#5673↑0.21↓8.5 years↑
"Whenever one or more creatures you control attack, add that much mana in any combination of
and/or
. Until end of turn, you don't lose this mana as steps and phases end."
Cosmic Crucible72%
$0.40↑#141010.72↑0.3 years
"At the beginning of your first main phase, add four mana in any combination of colors."
Neheb, Dreadhorde Champion72%
$0.51↑#3970↑0.347.5 years↑
"Whenever this card deals combat damage to a player or planeswalker, you may discard any number of cards. If you do, draw that many cards and add that much
. Until end of turn, you don't lose this mana as steps and phases end."
Zuko, Seeking Honor72%
$0.13↓#153970.13↓0.9 years
"Whenever this card deals combat damage to a player, put a +1/+1 counter on him."
Ant-Man, Elusive Avenger72%
$0.24↓#124080.370.3 years
"Whenever this card deals combat damage to a player, create that many Treasure tokens."
Storm the Vault // Vault of Catlacan72%
$5.40↑#3563↑0.378.8 years↑
"Whenever one or more creatures you control deal combat damage to a player, create a Treasure token."
Old Gnawbone72%
$46.70↑#935↑1.35↑5.2 years↑
"Whenever a creature you control deals combat damage to a player, create that many Treasure tokens."
Alluring Suitor // Deadly Dancer72%
$0.13↓#21358↓0.00↓4.9 years↑
"When this creature transforms into this card, add 
. Until end of turn, you don't lose this mana as steps and phases end."
Brazen Collector72%
$0.24↓#10452↑0.06↓2.2 years↑
"Whenever this creature attacks, add
. Until end of turn, you don't lose this mana as steps and phases end."
Eladamri's Vineyard70%
$2.24↑#7906↑0.18↓29.0 years↑
"At the beginning of each player's first main phase, that player adds 
."