When a unit with a move trigger (like Traveling Merchant) and another unit (like Yasuo) move to a battlefield held by a unit with a defend trigger (like Teemo Strategist), what is the order of trigger resolution?

Ruling: The move trigger is put onto the chain and resolves first, before the showdown happens. Then, when the showdown begins, the defend trigger resolves before the attack.

Sequence:

• Move trigger goes on the chain and resolves
• Showdown begins
• Defend trigger resolves
• Attack happens