Can Sandsoldier units summoned by cards like Arise! or Desert's Call be played to any battlefield you control, or must they be played to your base like Azir's legend ability requires?

Ruling: When instructed to play a Sandsoldier unit by cards like Arise! or Desert's Call, you can choose any valid location (your base or any battlefield you control). Only cards with specific restrictions (like Azir's legend ability) limit placement.

Nuances:

• The only general exception is when a card played from hidden instructs you to play a unit—that unit must be played to the same battlefield where the hidden card was played from.
• Cards will explicitly state placement restrictions when they apply.