Which mythology-inspired loyalty program feature helped Starbucks create its iconic brand identity?

In the intersection of ancient stories and modern commerce, mythology has long inspired customer loyalty programs and brand identities. From Nike's winged goddess of victory to Amazon's river of endless possibilities, legendary references create powerful marketing narratives. This trivia question explores how a famous retail chain incorporated mythology into its loyalty program strategy to create one of the most recognizable brand identities in coffee retail.

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The Siren loyalty tier system, based on Greek mythology's dangerous but alluring sea creatures
The Phoenix Rewards program, where points 'rise again' after expiration if customers make a purchase within 30 days
The Midas Touch bonus, giving every 10th purchase in gold status accounts free gold-level upgrades
The Odyssey Challenge, requiring customers to visit 20 different store locations to earn legendary status