When Yellow Azir (Sovereign) moves from base to a battlefield, can he move Sand Soldier tokens from a different battlefield to join him, or only from base?

Ruling: Yellow Azir can move token units from anywhere (base or other battlefields) to the battlefield where he moved.

Nuances:

• The ability does not specify a source location for the tokens, only that they move to where Azir moved
• This works similarly to how Charm can move units between battlefields