Well the animated series has a High 3-A Cosmology, and a High 3-A feat from the council.
They created the Veil and
could lower it. The Veil covers the infinite dimensions which all have separate space as I'll explain all below.
Infinite Dimensions/The Veil
In season 2, episode "B is for Betrayal", we gain more information about the size of the verse from various characters.
1. One of the wise men of Kandrakar explains to the Guardians about Kandrakar itself and more, stating...
"Come now, the fortress at the heart of infinity awaits."
The same character and another later states this when explaining the Aurameres to the Guardians...
"The Aurameres, and this is Luba, keeper of the Auramer globs, the source of all Guardian magic."
"The Aurameres transmit Kandrakar's mystic energy across the dimensions to the Heart and to the Guardians."
This tells us that Kandrakar is at the center of infinity and that it's energy is sent through the dimensions to reach the Heart of Kandrakar.
2. The Oracle (who is stated to have great wisdom) states that their are Infinite dimensions.
"From time immemorial, it has been the councils task to protect the infinite dimensions. But thirteen years ago, Prince Phobos came to power, the threat he possed was so grave, we were forced to quarantine Maridian from the other worlds to prevent the spread of his evil. And so, the Veil was rasied."
This is direct proof that the W.I.T.C.H. animated series has a cosmology that is infinite in size due to having infinite dimensions.
3. These dimensions are not just planetary in size.
When the Guardians first reach Kandrakar, you can
see everything is purple and this short conversation about it from Hay Lin and her Grandmother states...
"Hay Lin: But, what's with all the purple?"
"Yan Lin: It's the Veil, up close and personal."
So it's clear that people can outright see the Veil, however, in the previous episode "A is for Anonymous", we see Maridian before the Veil is dropped and
we see stars clearly and their is no purple barrier so this means more than just the planet is covered by the Veil, it's the entire dimension.
Even during the day, we didn't see the purple barrier so it's pretty obvious it's not just the planet.
4. The Veil spreads out across infinite space.
As shown, the Veil doesn't just cover only Maridian's dimension. It is directly shown to be around Kandrakar as well which I've already proven is at the center of the Infinite Dimensions. This means that it is spread across the infinite dimensions so Phobos couldn't reach any of them, which makes the Veil an infinite size construct.
5. The Infinite Dimensions are all separate space.
We learn the the dimensions are each have separate space as stated by the Oracle.
"Taranee: Um... just one tinsy winsy glitch. When the Veil went poof, didn't all the portals poor with it?"
"Oracle: The Veil's passing opens up the old ways of traversing dimensions, Mage."
The Mage then
creates what is known as a "fold in space" that lead to Maridian. So its pretty clear the dimensions are all have separate space.
The reason 2-A isn't on the table yet is because we need evidence that the dimensions are separate space and time. But currently the verse is High 3-A and has a High 3-A feat which can potentially scale if the Guardians are stated to be stronger than the council.
Edit
In the very next episode "C is for Changes" it gives us potential scaling for the Guardians to reach High 3-A at full power. The Guardians powers gain an increase after they left Kandrakar and they have this conversation about it...
"Irma: What's with our powers? There way stronger. Hello, I just made an indoor pool without even trying."
"Corneila: Tell me about it. Mine have been messed up since Kandrakar."
"Taranee: Kandrakar, that's it! Conservation of energy."
"Irma: Uh, non braniac definition please."
"Taranee: When we were in Kandrakar, the council lowered the Veil. All the mystic energy that was used to maintain it had to go somewhere. So it flowed back into the Heart of Kandrakar and each of our Aurameres."
Since it's established that the Veil is infinite in size, it would require infinite energy to maintain it. Plus we have this statement from the previous episode "B is for Betrayal" from the council members.
"The Aurameres, and this is Luba, keeper of the Oromer globs, the source of all Guardian magic."
"The Aurameres transmit Kandrakar's mystic energy across the dimensions to the Heart and to the Guardians."
This should be enough for a possible High 3-A rating at their full power. It being an outlier is likely out of the question as just like in the comics, it was established in season 1, episode "Mudslugs" that the Guardians are not at their strongest unless their unitied and if their at odds their power is greatly diminished. We also haven't seen them at full power yet (which I don't think happens until the last episode of season 2) so they really don't have any anti feats.
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