Illuna's last ability exiles the cards face up. All players will see what the card is if you put it into your hand.

Any land, instant, and sorcery cards exiled this way remain in exile.

If an Aura is put onto the battlefield without being cast, the Aura's controller-to-be chooses what it will enchant as it enters the battlefield. An Aura put onto the battlefield this way doesn't target anything (so it could be attached to an opponent's permanent with hexproof, for example), but the Aura's enchant ability restricts what it can be attached to. If the Aura can't legally be attached to anything, it remains in its current zone.

A nonland permanent card is an artifact, creature, enchantment, or planeswalker card.

You choose whether to put the card into your hand or onto the battlefield after seeing what the card is.