standard
future
historic
gladiator
pioneer
explorer
modern
legacy
pauper
vintage
penny
commander
brawl
alchemy
paupercommander
duel
oldschool
premodern
Rulings
You may choose Merfolk Skydiver as the target of its own ability.
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.
If a permanent has +1/+1 counters and -1/-1 counters on it, they’re removed in pairs as a state-based action so that the permanent has only one of those kinds of counters on it.
To proliferate, 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.
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.
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.
If a permanent has +1/+1 counters and -1/-1 counters on it, they’re removed in pairs as a state-based action so that the permanent has only one of those kinds of counters on it.
To proliferate, 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.
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.
Rulings
You may choose Merfolk Skydiver as the target of its own ability.
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.
If a permanent has +1/+1 counters and -1/-1 counters on it, they’re removed in pairs as a state-based action so that the permanent has only one of those kinds of counters on it.
To proliferate, 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.
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.
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.
If a permanent has +1/+1 counters and -1/-1 counters on it, they’re removed in pairs as a state-based action so that the permanent has only one of those kinds of counters on it.
To proliferate, 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.
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.
Your collection? Your decks?
Want to manage your collection and/or create decks?