In a casual game, a card you choose from outside the game comes from your personal collection. In a tournament event, a card you choose from outside the game must come from your sideboard.

A card that is exiled face down has no characteristics. You can’t choose it, even if you’re allowed to look at it.

An Eldrazi card is one with the subtype Eldrazi. Noncreature cards with devoid from the Battle for Zendikar block are Eldrazi-themed, but they are not Eldrazi cards.