Serpent's Soul-Jar
Artifact
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.
The coils spiral like time itself, carrying spirits back around from death to reawakening.
Dan Murayama Scott
Kaldheim Commander (KHC)
• #11Rulings
Players can respond to the triggered ability that exiles the card from your graveyard by removing it in some other way. If the card leaves the graveyard before the ability of Serpent's Soul-Jar exiles it, Serpent's Soul-Jar won't let you cast it.
(wotc • 2021-02-05)
The activated ability doesn't change when you can cast the creature spell. In most cases, this means during your main phase while the stack is empty, although flash may change this.
(wotc • 2021-02-05)
Rulings
Players can respond to the triggered ability that exiles the card from your graveyard by removing it in some other way. If the card leaves the graveyard before the ability of Serpent's Soul-Jar exiles it, Serpent's Soul-Jar won't let you cast it.
(wotc • 2021-02-05)
The activated ability doesn't change when you can cast the creature spell. In most cases, this means during your main phase while the stack is empty, although flash may change this.
(wotc • 2021-02-05)