Contagion Clasp
Artifact
, : Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
Legal in
Modern, Legacy, Vintage, Commander
Rulings (7)
Contagion Clasp's first ability is mandatory. If you're the only player who controls a creature, you must target one of them.
2011-01-01
An ability that triggers "Whenever you proliferate" triggers even if you chose no permanents or players while doing so.
2023-02-04
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.
2023-02-04
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.
2023-02-04