Can you react to Traveling Merchant's discard and draw trigger, and does the discard happen as a cost or on resolution?

Ruling: Traveling Merchant's move trigger can be responded to, and the discard happens at resolution (not as a cost). An opponent can respond to the trigger by returning Traveling Merchant to hand, and it will still be discarded for the effect.

Sequence:

• Traveling Merchant moves to battlefield, triggering discard/draw ability
• Opponent can respond (e.g., with Gust to return Merchant to hand)
• Effects resolve backward: Merchant returns to hand, then Merchant is still discarded for the move trigger effect

Nuances:

• The discard is not a cost, so even if Traveling Merchant is no longer on the battlefield when the trigger resolves, it can still be discarded from hand