Core Prowler

four generic mana Artifact Creature — Phyrexian HorrorPower and toughness2/2

Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)

When this creature dies, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

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Showing Mirrodin Besieged#103

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Core Prowler rulings

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
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.
2023-02-04
An ability that triggers "Whenever you proliferate" triggers even if you chose no permanents or players while doing so.
2023-02-04
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.
2023-02-04
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.

Core Prowler keyword rules

Proliferate Rule 701.27

To proliferate means to choose any number of permanents and/or players that have a counter, then give each one additional counter of each kind that permanent or player already has.

In a Two-Headed Giant game, poison counters are shared by the team. If more than one player on a team is chosen this way, only one of those players can be given an additional poison counter. The player who proliferates chooses which player that is. See rule , “Two-Headed Giant Variant.”

Infect Rule 702.90

Infect is a static ability.

Damage dealt to a player by a source with infect doesn’t cause that player to lose life. Rather, it causes that source’s controller to give the player that many poison counters. See rule .

Damage dealt to a creature by a source with infect isn’t marked on that creature. Rather, it causes that source’s controller to put that many -1/-1 counters on that creature. See rule .

If an object changes zones before an effect causes it to deal damage, its last known information is used to determine whether it had infect.

The infect rules function no matter what zone an object with infect deals damage from.

Multiple instances of infect on the same object are redundant.