Spiteful Sliver 
Creature — Sliver
$2.25 #4839 0.47 7.4 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%
$0.32↓#11828↓0.33↓28.6 years↑
"Whenever this creature is dealt damage, it deals that much damage to target opponent or planeswalker."
Wall of Souls87%
$1.65↓#16280↓0.13↓28.6 years↑
"Whenever this creature is dealt combat damage, it deals that much damage to target opponent or planeswalker."
Lavabelly Sliver82%
$0.37↓#55500.73↑7.4 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%
$1.59↓#13802↓0.32↓13.3 years↑
"Sliver creatures you control have "Whenever this creature attacks, it deals 1 damage to any target.""
Tephraderm78%
$0.25↓#28361↓0.12↓24.0 years↑
"Whenever a spell deals damage to this creature, this creature deals that much damage to that spell's controller."
Spitemare78%
$0.31↓#12334↓0.15↓18.2 years↑
"Whenever this creature is dealt damage, it deals that much damage to any target."
Brash Taunter78%
$2.22↓#812↑0.58↑6.3 years↓
"Whenever this creature is dealt damage, it deals that much damage to target opponent."
Donna Noble76%
$0.37↓#11025↓0.06↓3.0 years↓
"Whenever this card or a creature it's paired with is dealt damage, this card deals that much damage to target opponent."
Fiendlash76%
$0.38↓#49580.10↓5.2 years↓
"Whenever equipped creature is dealt damage, it deals damage equal to its power to target player or planeswalker."
Bladeback Sliver76%
$0.17↓#21523↓0.64↑7.4 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 Deathspitter76%
$0.16↓#14744↓0.13↓8.8 years↑
"Whenever this creature is dealt damage, it deals 2 damage to target opponent or planeswalker."
Boros Reckoner74%
$0.24↓#6358↓0.3813.7 years↑
"Whenever this creature is dealt damage, it deals that much damage to any target."
Sun-Crowned Hunters74%
$0.18↓#15253↓0.05↓9.1 years↑
"Whenever this creature is dealt damage, it deals 3 damage to target opponent or planeswalker."
Truefire Captain74%
$0.23↓#12831↓0.15↓8.0 years
"Whenever this creature is dealt damage, it deals that much damage to target player."
Tempered Sliver74%
$0.32↓#11641↓0.35↓7.4 years
"Sliver creatures you control have "Whenever this creature deals combat damage to a player, put a +1/+1 counter on it.""
Blazing Sunsteel74%
$9.52↑#6372↓0.12↓5.9 years↓
"Whenever equipped creature is dealt damage, it deals that much damage to any target."
Fungus Sliver72%
$0.57↓#13416↓0.29↓20.0 years↑
"All Sliver creatures have "Whenever this creature is dealt damage, put a +1/+1 counter on it.""
Black Panther, Most Dangerous70%
$0.38↓#17511↓0.440.3 years↓
"Whenever this card is dealt damage, he deals that much damage to any other target."
Wrathful Red Dragon70%
$9.32↑#2255↑0.484.4 years↓
"Whenever a Dragon you control is dealt damage, it deals that much damage to any target that isn't a Dragon."
Stuffy Doll70%
$6.00↑#2257↑0.62↑20.0 years↑
"Whenever this creature is dealt damage, it deals that much damage to the chosen player."