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Siempre que Morcant, alta perfecta u otro Elfo que controlas entre, cada oponente perjudica 1. (Cada uno pone un contador -1/-1 sobre una criatura que controla.)
Girar tres Elfos enderezados que controlas: Prolifera. Activa esto solo como un conjuro. (Elige cualquier cantidad de permanentes y/o jugadores y luego pon sobre cada uno un contador de cada tipo que ya tenga.)
You don't have to choose every permanent or player that has a counter—only the ones you want to add counters to. Since "any number" includes zero, you don't have to choose any permanents at all, and you don't have to choose any players at all.
When you proliferate, you can choose any permanent that has a counter, including ones controlled by opponents. You can choose any player who has a counter, including opponents. You can't choose cards in any zone other than the battlefield, even if they have counters on them.
If a player or permanent has more than one kind of counter on it, and you choose for it to get additional counters, it must get one of each kind of counter it already has. You can't have it get just one kind of counter it already has and not the others.
If High Perfect Morcant enters at the same time as one or more other Elves you control, its first ability will trigger for each of those other Elves as well as itself.
Players can respond to a spell or ability whose effect includes proliferating. Once that spell or ability starts to resolve, however, and its controller chooses which permanents and players will get new counters, it's too late for anyone to respond.