"Until end of turn, each creature's power and toughness becomes equal to its base power and toughness." Note that this has some unexpected interactions with cards like Turn to Frog, About Face, and a few other types of cards.'
Without outright stating an impossibility, this kind of functionality can't really be achieved in Magic.
By definition, a replacement effect replaces some set of events A with some other set of events B. But due to how static abilities and continuous effects work, static abilities don't actually cause events to happen in a way that is compatible with replacement effects. Therefore, you can't use a replacement effect to nullify a static ability.
As far as MattTheGathering's wording is concerned, it works in the sense that it still allows for P/T-modifying counters to work. But it also allows for cards like Giant Growth to continue working as normal.
Due to the specificity of what you want, it would be best to spell out specifically what kinds of P/T modification are nullified and which aren't, either in rules text or in reminder text. I would go with something like the following:
Effects of spells and abilities can't increase or decrease a creature's power or toughness. (Its power and toughness can't be changed from its base power or toughness except by any counters on it.)
The above outright states that modifying P/T with things like Giant Growth or anthems are impossible game events. Among the sublayers in layer 7, the only layers that remain unchanged are the ones for CDA's, the one for base power and toughness setting, and the one for P/T modifications from counters.
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How to use card tags (please use them for everybody's sanity)
[c]Lightning Bolt[/c] -> Lightning Bolt
[c=Lightning Bolt]Apple Pie[/c] -> Apple Pie
Vowels-Only Format Minimum deck size: 60 Maximum number of identical cards: 4 Ban list: Cards whose English names begin with a consonant, Unglued and Unhinged cards, cards involving ante, Ancestral Recall
There are those cards that change the text of a card, by replacing instances of a color or a creature type with another. I could use that to replace "get +1/+1" with "get +0/+0". However, why not just destroy or remove that permanent from the game? It's much more straightfoward.
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Artifact
Effects that give +x/+x to any creature give +0/+0 instead.
The purpose of it is to negate any card that boosts creature's P/T, except for giving +1/+1 counters.
By definition, a replacement effect replaces some set of events A with some other set of events B. But due to how static abilities and continuous effects work, static abilities don't actually cause events to happen in a way that is compatible with replacement effects. Therefore, you can't use a replacement effect to nullify a static ability.
As far as MattTheGathering's wording is concerned, it works in the sense that it still allows for P/T-modifying counters to work. But it also allows for cards like Giant Growth to continue working as normal.
Due to the specificity of what you want, it would be best to spell out specifically what kinds of P/T modification are nullified and which aren't, either in rules text or in reminder text. I would go with something like the following:
The above outright states that modifying P/T with things like Giant Growth or anthems are impossible game events. Among the sublayers in layer 7, the only layers that remain unchanged are the ones for CDA's, the one for base power and toughness setting, and the one for P/T modifications from counters.
[c]Lightning Bolt[/c] -> Lightning Bolt
[c=Lightning Bolt]Apple Pie[/c] -> Apple Pie
Vowels-Only Format
Minimum deck size: 60
Maximum number of identical cards: 4
Ban list: Cards whose English names begin with a consonant, Unglued and Unhinged cards, cards involving ante, Ancestral Recall
There are those cards that change the text of a card, by replacing instances of a color or a creature type with another. I could use that to replace "get +1/+1" with "get +0/+0". However, why not just destroy or remove that permanent from the game? It's much more straightfoward.