Oracle

Artifact 

When Contagion Clasp enters the battlefield, put a -1/-1 counter on target creature.
4, T: Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

NederMagic FAQ

Vraag: Hoe werkt proliferate?
Antwoord: Dat kun je hier lezen.

Tournooi-info

Legal in: Vintage, Legacy, Modern, Commander

Officiele rulings

2011-01-01 - wotc
You can choose any player that has a counter, including yourself.

2011-01-01 - wotc
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.

2011-01-01 - wotc
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.

2011-01-01 - wotc
If a permanent chosen this way has multiple kinds of counters on it, only a single new counter is put on that permanent.

2011-01-01 - wotc
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.

2011-01-01 - wotc
Contagion Clasp's first ability is mandatory. If you're the only player who controls a creature, you must target one of them.

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