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Core Prowler

1 printing listed in our catalog, from newest to oldest.

Core Prowler, Mirrodin Besieged printing
Mirrodin Besieged MBS · No. 103 2011-02-04

Card text

{4}
Artifact Creature — Phyrexian Horror
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.)
2 / 2
Keywords: Proliferate, Infect
EDHREC rank #7734 Uncommon Not on the Reserved List
Seen in store
Nobody lists it in Quebec right now.

Run a comparison: we query the stores live, it may have arrived this morning.

Standard ∅ Not legal
Pioneer ∅ Not legal
Modern ✓ Legal
Legacy ✓ Legal
Vintage ✓ Legal
Pauper ∅ Not legal
Commander ✓ Legal
Oathbreaker ✓ Legal
Brawl ∅ Not legal
Historic ∅ Not legal
Timeless ∅ Not legal
Alchemy ∅ Not legal
Explorer ∅ Not legal
Gladiator ∅ Not legal
Penny ∅ Not legal
Duel ✓ Legal

Official rulings

6 rulings · in English, source Scryfall

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 · Wizards of the Coast

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 · Wizards of the Coast

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.

2023-02-04 · Wizards of the Coast

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

2023-02-04 · Wizards of the Coast

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 · Wizards of the Coast

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 · Wizards of the Coast

All printings

Core Prowler, Mirrodin Besieged printing
Mirrodin Besieged
MBS · #103
Uncommon
Tapt's Canadian calculation. How to read these prices
Fusion Gaming · Condition HP