Those are all with limited mana

I'm talking about Unlimited mana, which Excalibur benefits from most because it's just a mana cannon

Basicaly yes, but even then there's no 100 percent chance she wins this, like I said we've seen this kind of scenario play out with Artoria alter due to having Sakura as a master and by extension having the mana to fire it as a mana cannon but we saw in her fight with Medusa and Shirou even then she can still loose and now she has to deal with five other servants all of who have unlimited mana and two of which have Noble Phantsm that have overpowered Exaclibur in the past, and two Noble Phantsm that are equall to Excalibur.

Saber didn't have infinite mana capacity in that fight. That was similar to the way the jeweled sword works where she is constantly receiving more but cannot exceed her limit. Breaking her limit like shown in this post would give her multiversal power which has already been hinted at

Okay now you have me convided because I heard in heaven's feel it was Unlimited so either I was misinformed or I'm just going crazy but yeah if it reaches multiversal she wins my only question is does she still need charge time for her Excalbur blasts or not because if she does she could be in trouble.

Shes receiving mana from Sakura because she's sakura's servant

She doesn't need time to charge her excalibur blasts as long as she receives mana fast enough

Okay yeah in that case the only way I see someone else winning is if Gilgamesh summons either his ship of light or Vimana to evoide the blasts and open a portal right next to her to either take out one of her hands or hit her point blank with Noble phantasms as we have seen he can open portals as close or as far from his enemy and anywhere he wants.

Yeah GIlgamesh and Artoria in my opinion are the two top contenders but it's hard to tell which one is stronger when they could easily both defeat the other

Also it's weird having no Avalon because Saber is losing one of her strongest abilities and the reason her endurance is so high

I view it as fair as with Avalon it's basically the ultimate cheat sheet, I still remember were the plot deamed she win in her second fight with Gil and she magically gets Avalon and wins when the whole fight she was getting tossed around. But that's besides the point, If Gil keeps at range and surraounds her with portals and fires Noble phantasms she's doomed as he could fire anything and their effects would hit Artoria all at once ranging from poison, curses, fire, the phantasms exploding or any other random effect and she has no defence against that, but if he's in range of the blast he's doomed unless he has something to block it.

He probably has defensive Noble Phantasms able to handle Excaliblasts, since he doesn't meet the requirements to unleash Excalibur at the level it was at to bring down ORT, and he should have, say, the prototype for Achilles's shield, which, even if it can't fully take an Excaliblast, can probably take a lot of its power before breaking.

True as even with unlimited mana it doesn't mean all of it's power is going to be releaised as it's full power is only unleashed agasint things like Ultimate ones, ORT and Sefar. so Gilgamesh could very well use multiple defences to block Excalibur to buy him time to charge Enuma Elish which has been shown to be ridducaly strong, hell in Strange fake he would have destroyed the earth if Enkidu didn't use their Enuma Elish to put things back together.