Serpent's Soul-Jar 
Artifact
$0.29 #16397 0.13 5.7 years
Whenever an Elf you control dies, exile it.
, Pay 2 life: Until end of turn, you may cast a creature spell from among cards exiled with this artifact.Click a line or tag to filter
Cards similar to Serpent's Soul-Jar 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.
Promise of Tomorrow86%
$0.35↑#166910.38↑5.9 years
"Whenever a creature you control dies, exile it."
Purgatory84%
$1.57↑#28717↓0.36↑30.0 years↑
"Whenever a nontoken creature is put into your graveyard from the battlefield, exile that card."
+1 more matching line
Chaos Shrine's Black Crystal76%
$4.08↑#12452↑0.60↑0.9 years↓
"Whenever a nontoken creature you control dies, exile it."
Prowess of the Fair76%
$3.15↑#5757↑0.41↑19.0 years↑
"Whenever another nontoken Elf is put into your graveyard from the battlefield, you may create a 1/1 green Elf Warrior creature token."
Colfenor's Urn72%
$0.33↑#6938↑0.25↑19.0 years↑
"Whenever a creature with toughness 4 or greater is put into your graveyard from the battlefield, you may exile it."
Miara, Thorn of the Glade70%
$0.27↓#7942↑0.225.9 years
"Whenever this card or another Elf you control dies, you may pay 
and 1 life. If you do, draw a card."
and 1 life. If you do, draw a card."