Community
Serum Snare
Instant
Return target nonland permanent to its owner's hand. If that permanent had mana value 3 or less, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
"I bring a message from the Autonomous Furn—argh!"
Rulings (6)
An ability that triggers "Whenever you proliferate" triggers even if you chose no permanents or players while doing so.
Feb 4, 2023
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.
Feb 4, 2023
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.
Feb 4, 2023
Legality
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