Do gears (like Ballista) start a chain when played, and do their activated abilities start a chain?

Ruling: Playing a gear card does start a chain, but if it's a permanent, no player receives priority before it resolves. Activated abilities of gears also start a chain.

Sequence:

• When you play a gear permanent, it starts a chain
• The permanent resolves without players receiving priority
• When you activate an ability on a gear, it starts a chain with normal priority