Etali, Primal Storm

Because all attacking creatures are chosen at once, a creature cast this way can't attack during the same combat as Etali, even if it has haste.

If you cast more than one of the exiled cards, you choose the order in which to cast them. 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.

If you cast any of the exiled cards, you do so as part of the resolution of the triggered ability. You can't wait to cast them later in the turn. Timing permissions based on a card's type are ignored, and the spells resolve before blockers are declared.