2023-02-04 : Casting an exiled card causes it to leave exile. You can't cast it multiple times.

2023-02-04 : Neyali's effect doesn't change when you can cast the exiled card. For example, if you exile a sorcery card, you can cast it only during your main phase when the stack is empty.

2023-02-04 : The card Neyali exiles is exiled face up.

2023-02-04 : The effect allowing you to cast the exiled card if you attacked with a token continues to apply even if Neyali leaves the battlefield or another player gains control of it. It also continues to apply during later turns—as long as you attacked with a token during those later turns.

2023-02-04 : The second ability of Neyali, Suns' Vanguard triggers for each player you are attacking with one or more tokens. It does not trigger if you are attacking a planeswalker a player controls, but not that player.

2023-02-04 : You can cast the exiled card if the token that attacked is still in combat, if it's left combat, if it's left the battlefield, or even if combat is over.