If Aurora is readied by Ride of Wind after Deadbloom starts a showdown, will Aurora's ability trigger again at end of turn?

Ruling: No, Aurora will not trigger again. Aurora is not an exhaust ability, it is an end of turn trigger that only triggers once at the end of your turn.

Nuances:

• Some players physically exhaust Aurora cards to track that they've been used (especially when multiple Auroras are in play), but this is just a tracking method - Aurora does not actually have an exhaust ability.