Mark of Sakiko 

Enchantment — Aura
$3.33 #11601 0.25 21.6 years
Enchant creature
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."
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Cards similar to Mark of Sakiko 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.
Sakiko, Mother of Summer90%
$0.40↓#103290.43↑21.6 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."
Photon, Mighty Marvel90%
$0.28↓#14804↓0.00↓0.2 years↓
"Whenever this card 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."
Rapacious One75%
$0.13↓#103280.06↓16.4 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
.""
Sticky Fingers70%
$0.21↓#1845↑0.174.4 years↓
"Enchanted creature has menace and "Whenever this creature deals combat damage to a player, create a Treasure token.""