Plargg and Nassari

Cards not cast this way, including any land cards, remain in exile.

A spell you cast this way can be the target of a later spell you cast this way. However, permanent spells cast this way won't resolve until you're done casting spells, so the permanents they become can't be the target of spells cast this way. For example, if you exile Twincast and Lightning Strike, you can cast Lightning Strike and then cast Twincast targeting it, but if you exile a creature card and an Aura card, you can't cast that Aura targeting that creature.

All the spells you cast due to the triggered ability are cast during the resolution of that ability. You can cast them in any order.