伝染病の留め金
アーティファクト
伝染病の留め金が戦場に出たとき、クリーチャー１体を対象とし、それの上に－１/－１カウンターを１個置く。
, 
：増殖を行う。 （���なたはカウンターの置かれているパーマネントやプレイヤーを望む数だけ選び、その後それぞれに、その上にすでに置かれているカウンターのうち１種類を１個置く。）
イラスト：
Scars of Mirrodin#144アンコモン日本語適正
裁定
You can choose any player that has a counter, including yourself.
You can choose any permanent that has a counter, including ones controlled by opponents. You can’t choose cards in any zone other than the battlefield, even if they have counters on them, such as suspended cards or a Lightning Storm on the stack.
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.
If a permanent chosen this way has multiple kinds of counters on it, only a single new counter is put on that permanent.
Players can respond to the 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.
Contagion Clasp’s first ability is mandatory. If you’re the only player who controls a creature, you must target one of them.