Dark Intimations

The draconic Planeswalker Nicol Bolas is not featured in the Aether Revolt set. He must be up to something nefarious elsewhere.

If an opponent can't sacrifice a creature or planeswalker, that player still discards a card if able. You still return a creature or planeswalker card to your hand if able, even if no opponent sacrifices a permanent and/or discards a card. You still draw a card even if you can't return a card to your hand.

When Dark Intimations resolves, first the player whose turn it is (if that player is an opponent) chooses which creature or planeswalker they will sacrifice, then each other opponent in turn order does the same, then all chosen permanents are sacrificed at the same time. Then each opponent in the same order chooses a card in their hand without revealing it, then all chosen cards are discarded at the same time.