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
The toolkit contains over 50 useful cards to power up decks, including dozens of Trainer cards, Arceus V, and Arceus VSTAR, over 100 Basic Energy cards, 4 Pokemon TCG booster packs, 65 card sleeves, a Deck Builders Guide, 6 damage-counter dice, a competition-legal coin-flip die, 2 condition markers, an acrylic VSTAR marker, and a code card for Pokemon TCG Live
At the time the ability is considered activated (after all costs are paid), Rings of Brighthearth is no longer on the battlefield.
Given how rarely the plan works out in my experience, it's as big a cost as possible
But that rule changed with Magic 2014