At the time the ability is considered activated (after all costs are paid), Rings of Brighthearth is no longer on the battlefield.
In the past few months alone, millions of dollars worth of Pokemon cards have changed hands, with one particularly rare card smashing through the million-dollar mark in July of 2022
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
No risk of confusing players by showing too many background Pokemonits all alternate art, so the stakes are lower, and creativity is higher
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