Radiation is an invisible tide that seeps into the bones of the land, changing it irrevocably.

放射能は、その土地の髄まで浸透し、取り返しのつかない状態に変容させる、目に見えない波のようなものである。

容赦無い潮流

あなたが呪文１つを唱えるたび、増殖を行う。

辐射这股无形浪潮已然深入大地骨髓，不可逆转地改变了地表上的一切。

难阻浪潮

Inexorable Tide

Whenever you cast a spell, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Fallout

Historic Anthology 2

Whenever you cast a spell, Inexorable Tide's ability triggers and goes on the stack on top of it. It will resolve (and you'll proliferate) before the spell resolves.

An ability that triggers "Whenever you proliferate" triggers even if you chose no permanents or players while doing so.

If a permanent ever has both +1/+1 counters and -1/-1 counters on it at the same time, they're removed in pairs as a state-based action so that the permanent has only one of those kinds of counters on it.

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.

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.

To 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.

You don't have to choose every permanent or player that has a counter, only the ones you want to add another counter 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.