Spiteful Sliver 
Creature — Sliver
$2.07 #4756 0.64 7.2 years
Sliver creatures you control have "Whenever this creature is dealt damage, it deals that much damage to target player or planeswalker."
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Cards similar to Spiteful Sliver 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.
Mogg Maniac88%
$0.35↓#11772↓0.44↓28.5 years↑
"Whenever this creature is dealt damage, it deals that much damage to target opponent or planeswalker."
Wall of Souls87%
$2.06↓#16164↓0.29↓28.5 years↑
"Whenever this creature is dealt combat damage, it deals that much damage to target opponent or planeswalker."
Lavabelly Sliver81%
$0.55↓#54710.707.2 years
"Sliver creatures you control have "When this creature enters, it deals 1 damage to target player or planeswalker and you gain 1 life.""
Thorncaster Sliver80%
$1.51↓#13576↓0.36↓13.1 years↑
"Sliver creatures you control have "Whenever this creature attacks, it deals 1 damage to any target.""
Brash Taunter78%
$1.61↓#790↑0.49↓6.2 years↓
"Whenever this creature is dealt damage, it deals that much damage to target opponent."
Tephraderm78%
$0.24↓#27989↓0.31↓23.9 years↑
"Whenever a spell deals damage to this creature, this creature deals that much damage to that spell's controller."
Spitemare77%
$0.33↓#12410↓0.7318.1 years↑
"Whenever this creature is dealt damage, it deals that much damage to any target."
Donna Noble76%
$0.42↓#10942↓0.50↓2.9 years↓
"Whenever this card or a creature it's paired with is dealt damage, this card deals that much damage to target opponent."
Fiendlash76%
$0.39↓#49780.33↓5.1 years↓
"Whenever equipped creature is dealt damage, it deals damage equal to its power to target player or planeswalker."
Bladeback Sliver75%
$0.16↓#21211↓0.44↓7.2 years
"As long as you have no cards in hand, Sliver creatures you control have "
: This creature deals 1 damage to target player or planeswalker.""
: This creature deals 1 damage to target player or planeswalker.""
Frilled Deathspitter74%
$0.16↓#14568↓0.29↓8.6 years↑
"Whenever this creature is dealt damage, it deals 2 damage to target opponent or planeswalker."
Truefire Captain74%
$0.24↓#12709↓0.20↓7.9 years
"Whenever this creature is dealt damage, it deals that much damage to target player."
Tempered Sliver74%
$0.29↓#11436↓0.31↓7.2 years
"Sliver creatures you control have "Whenever this creature deals combat damage to a player, put a +1/+1 counter on it.""
Sun-Crowned Hunters74%
$0.21↓#15040↓0.14↓8.9 years↑
"Whenever this creature is dealt damage, it deals 3 damage to target opponent or planeswalker."
Boros Reckoner74%
$0.28↓#6342↓0.17↓13.6 years↑
"Whenever this creature is dealt damage, it deals that much damage to any target."
Blazing Sunsteel73%
$15.51↑#6474↓0.575.8 years↓
"Whenever equipped creature is dealt damage, it deals that much damage to any target."
Fungus Sliver72%
$0.49↓#13366↓0.33↓19.9 years↑
"All Sliver creatures have "Whenever this creature is dealt damage, put a +1/+1 counter on it.""
Stuffy Doll70%
$5.73↑#2248↑0.6919.9 years↑
"Whenever this creature is dealt damage, it deals that much damage to the chosen player."
Justice70%
$0.21↓#27518↓0.12↓31.3 years↑
"Whenever a red creature or spell deals damage, this enchantment deals that much damage to that creature's or spell's controller."
Wrathful Red Dragon70%
$6.44↑#2260↑0.44↓4.2 years↓
"Whenever a Dragon you control is dealt damage, it deals that much damage to any target that isn't a Dragon."