When Rell's attack trigger and Reaver's Row both go on the chain, do you have to reveal which gear you're attaching to Rell when placing the trigger on the chain, or can you wait until resolution?

Ruling: You do not have to reveal which gear you're attaching to Rell when placing the trigger on the chain. The gear is selected at resolution.

Sequence:

• Rell's attack trigger goes on the chain
• Reaver's Row trigger goes on the chain
• You do not declare which gear at this point
• On resolution of Rell's trigger, you select and play the gear

Nuances:

• Because Rell chooses a card in a private zone (your hand), it's not a target and doesn't need to be declared when added to the chain
• You don't even have to tell your opponent what you're going to do until resolution