Neheb, the Worthy

Neheb is affected by its own power-modifying ability once you have one or zero cards in hand.

When Neheb's triggered ability resolves, first the player whose turn it is chooses a card to discard, then each other player in turn order chooses a card to discard, then all of those cards are discarded simultaneously. No one sees what the other players are discarding before deciding which card to discard.