→ Each opponent loses the game, Near-infinite lifeloss for all players, Shuffle all hands, graveyards and permanents on the battlefield into their owner's library
The second ability applies only to casting spells. It does not, for example, change when you may activate abilities that can be activated "only as a sorcery."
2023-06-16
If the creature you choose as your Ring-bearer was already your Ring-bearer, that still counts as choosing that creature as your Ring-bearer for the purpose of abilities that trigger "whenever you choose a creature as your Ring-bearer" or abilities that care about which creature was chosen as your Ring-bearer.