Does conquering a battlefield and using its effect start a chain, or does it happen instantly?

Ruling: Battlefield effects work the same as unit effects - triggered effects (like "When you conquer") start a chain, while passive effects do not.

Sequence:

• You must go through showdown steps to conquer a battlefield (simply moving to it is not enough)
• At the end of the showdown, if only your units remain at the battlefield, you conquer it
• The battlefield's triggered effect then starts a chain
• If you control multiple effects that trigger simultaneously (like a unit effect and battlefield effect), you choose the order to put them on the chain

Nuances:

• Moving to a battlefield does not automatically conquer it - you must complete the showdown with only your units remaining
• The showdown itself also causes a chain before the conquest trigger resolves