Basal Sliver 
Creature — Sliver
$0.72 #8998 0.06 20.0 years
All Slivers have "Sacrifice this permanent: Add ."
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Cards similar to Basal 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.
Gemhide Sliver84%
$0.27↓#3187↑0.56↑20.0 years
"All Slivers have "
: Add one mana of any color.""
: Add one mana of any color.""
Darkheart Sliver80%
$0.39↓#14068↓0.42↑19.7 years
"All Slivers have "Sacrifice this permanent: You gain 3 life.""
Manaweft Sliver80%
$1.52↑#3287↑0.50↑13.3 years↓
"Sliver creatures you control have ": Add one mana of any color.""
: Add one mana of any color.""
Thermopod78%
$0.26↓#102790.44↑20.2 years
"Sacrifice a creature: Add 
."
."
Victual Sliver71%
$0.53↓#21426↓0.31↑28.6 years↑
"All Slivers have ", Sacrifice this permanent: You gain 4 life.""
, Sacrifice this permanent: You gain 4 life.""
Ashnod's Altar70%
$14.33↑#134↑1.13↑32.6 years↑
"Sacrifice a creature: Add 
."
."