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At the time the ability is considered activated (after all costs are paid), Rings of Brighthearth is no longer on the battlefield.

But that rule changed with Magic 2014

Given how rarely the plan works out in my experience, it's as big a cost as possible

So if you do decide to use a Sail Fossil and an Amaura card in your deck, make sure to get a few energy cards on this card before you put it into the active Pokemon spot, or be prepared to attach three more energy cards on Amaura when in the active Pokemon spot to retreat it

Klothys, God of Destiny Klothys, God of Destiny is an interesting aggro card against control players