Hello there.
Wanted to point out a possibly very overpowered thing about the tear of goddess item tree.

As you know, the mana charge is a unique passive. So it isn't possible to stack Tear of the Goddess, Manamune or Archangels Staff.

But, in the new final forms - Muramana and Seraph's embrace, the 1000 Mana become a non-unique passive. Means the 1k mana of tear of goddess becomes stackable (without real limit, at that).

Of course, it would take time to fully stack multiple tears.
While its most OP on Ryze (for obvious reasons), the items stacked by themselves already end up in a huge ad+ap boost.

While unrealistic to get this much in a game of normal duration, it would be possible to get 6-7k mana. Imagine this paired with Ryze's damage, and/or the AP/AD boni alone with Muramasa's and Seraph's toggle/active. 560 additional magic damage on-hit and on single target abilities. 1-2k dmg shield.

I think there should be a limit to how much mana can be stacked from the Tear of Goddess item tree. Best might be to have the 1k mana bonus of Muramasa and Seraph's Embrace be an unique passive on each item. That way one could still get both of them to get 2k mana, but not more than that.
Also maybe disable the possibility of buying more than 2 Tear of Goddess.

not really, just due to time issues. If you get all those tears stacked, you deserve the bonus they give, considering you are investing in a lategame hypersetup, that isn't that great until you reach it.

It takes 18 minutes and 48 seconds of casting to stack 2 ToG items. That is 1 cast ever ~3 seconds no more, no less. If you invested that, and the ~6k gold into them, you deserve it. Even still, thats only 2k mana. you are still a squishy target, and the shield has a long cooldown.