Attacking tokens you control have double strike. Whenever one or more tokens you control attack a player, exile the top card of your library. During any turn you attacked with a token, you may play that card.
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Casting an exiled card causes it to leave exile. You can't cast it multiple times.
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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.
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The card Neyali exiles is exiled face up.
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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.
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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.
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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.