While good ol cards like Misty, Celebi EX, and Moltres EX come to mind when one thinks of coin flips in Pokmon TCG Pocket, the benefits are more pronounced for Pokmon that gain a lot through heads achieved from just 1-2 coin flips
If at least one opponent has more life, creatures, or cards in hand than you, you'll get the appropriate bonus
Between the 10 Secret Rares, the 25 cards available as Starlight Rares, and the new Sacred Beast retrains arriving as Super Rares, there is no shortage of prized pulls to hunt for in this one
In a blog, Mark Rosewater, lead designer on the game, said that it is counter-intuitive to have the Ring bring in-game positive effects, but it was the only way to get players to actually interact with it