Do 'when I attack' and 'when I defend' effects go on the same chain, and in what order do they resolve?

Ruling: 'When I attack' and 'when I defend' effects do go on the same chain. 'When I attack' effects are added to the chain first, then 'When I defend' effects are added after.

Sequence:

• Attack triggers finalize
• Defend triggers finalize
• Nothing else gets put on chain
• Defend effect resolves (last in, first out)
• Attack effect resolves

Nuances:

• If a unit has multiple 'when I defend' triggers (like Ezreal defending at Reaver's Row), the controller can order those effects however they like since they have the same trigger condition
• The keyword 'here' is always determined on resolution, not declaration, so if a target moves zones before resolution, the effect may fail
• If a targeted unit changes controller before resolution, it may no longer be a valid target if the effect specifies 'enemy unit'