When Vayne conquers Zaun Warrens, can you choose the order of triggers, and are you forced to use Vayne's bounce effect before the Battlefield discard/draw?

Ruling: You choose the order of the triggers. You are not forced to use Vayne's bounce effect as it says "you may", but you must resolve the Zaun Warrens effect as much as possible.

Sequence:

• Both triggers happen at the same time (both are "when conquer")
• You choose which order to resolve them
• Vayne's effect is optional ("you may")
• Zaun Warrens effect is mandatory ("do as much as you can")

Nuances:

• The "you may" wording on Vayne means you can choose not to bounce her
• The Battlefield effect must be resolved as much as possible regardless of order chosen