All Sliver creatures have provoke. (Whenever a Sliver attacks, its controller may have target creature defending player controls untap and block it if able.)
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.
First Sliver's Chosen80%
$0.21↓#16843↓0.18↓7.2 years↓
"Sliver creatures you control have exalted."
sliver-stackable, typal-sliver, keyword-anthem
Leeching Sliver76%
$0.72↑#109740.22↓12.1 years↓
"Whenever a Sliver you control attacks, defending player loses 1 life."
sliver-stackable, typal-sliver, attacking-matters
Heart Sliver76%
$1.32↑#6275↑0.4728.9 years↑
"All Sliver creatures have haste."
typal-sliver, keyword-anthem, symmetrical
Reflex Sliver76%
$0.28↓#142320.89↑19.6 years↓
"All Sliver creatures have haste."
typal-sliver, keyword-anthem, symmetrical
Frenzy Sliver75%
$0.28↓#19151↓0.65↑19.3 years↓
"All Sliver creatures have frenzy 1."
sliver-stackable, typal-sliver, keyword-anthem
Sidewinder Sliver75%
$0.27↓#121210.4419.9 years↓
"All Sliver creatures have flanking."
sliver-stackable, typal-sliver, keyword-anthem
Synchronous Sliver74%
$0.35↓#17251↓0.11↓19.6 years↓
"All Sliver creatures have vigilance."
typal-sliver, keyword-anthem, symmetrical
Virulent Sliver74%
$0.36↓#6591↑0.64↑19.3 years↓
"All Sliver creatures have poisonous 1."
sliver-stackable, typal-sliver, keyword-anthem
Watcher Sliver74%
$0.13↓#18013↓0.27↓19.9 years↓
"All Sliver creatures get +0/+2."
sliver-stackable, typal-sliver, typal-creature
Spitting Sliver74%
$0.27↓#21382↓0.10↓19.6 years↓
"All Sliver creatures have first strike."
typal-sliver, keyword-anthem, symmetrical
Talon Sliver74%
$0.28↓#142380.27↓28.9 years↑
"All Sliver creatures have first strike."
typal-sliver, keyword-anthem, symmetrical
Thorncaster Sliver74%
$1.51↑#135760.3613.1 years↓
"Sliver creatures you control have "Whenever this creature attacks, it deals 1 damage to any target.""