Sidar Jabari of Zhalfir
Legendary Creature — Human Knight
Eminence — Whenever you attack with one or more Knights, if Sidar Jabari is in the command zone or on the battlefield, draw a card, then discard a card.
Flying, first strike
Whenever Sidar Jabari deals combat damage to a player, return target Knight creature card from your graveyard to the battlefield.
Simon Dominic
Rulings
Sidar Jabari must be on the battlefield or in the command zone at the moment you attack with one or more Knights and also as the triggered ability tries to resolve. Notably, if Sidar Jabari is on the battlefield and its eminence ability triggers, but it's put into the command zone before that ability resolves, that ability won't do anything as it resolves. This is because an object that changes zones is considered a new object.
(wotc • 2023-04-14)
Rulings
Sidar Jabari must be on the battlefield or in the command zone at the moment you attack with one or more Knights and also as the triggered ability tries to resolve. Notably, if Sidar Jabari is on the battlefield and its eminence ability triggers, but it's put into the command zone before that ability resolves, that ability won't do anything as it resolves. This is because an object that changes zones is considered a new object.
(wotc • 2023-04-14)