But how much AP/AD will you have if you use BOTH 
and 
? Couldnt really find anyone saying a general idea of these numbers. Just by using the mana, not the base AD/AP (even though all champs have 0 AP base), I am just curious as to how much bonus would one get for having 4000-6000 mana. My math is also not the greatest so, any help would be appreciated.
I'm not sure you'd be able to finish stacking both in one game. TBH I've never tried it and there are so few hybrid champs, particularly ones that'd need so much mana, it's probably not worth testing.
Hmm... I won't go into detail about how bad it is of an idea to get both Muramana and Seraph's Embrace; the folks below me have that covered. In any case, let's see if I can't answer your question.
Assuming you have managed to complete both items into their higher forms, your champion has no AD/AP, or a base mana pool, let's begin with the states each item provides.
Muramana
+1000 Mana
+20 Attack Damage
+7 / 5 Mana Regeneration
UNIQUE Passive: Gain attack damage equal to 2% of your maximum mana.
Seraph's Embrace
+1000 Mana
+60 Ability Power
+10 / 5 Mana Regeneration
UNIQUE Passive: Gain ability power equal to 3% of your maximum mana.
So, let's see where we are. Currently, we have +2000 mana (Again, not counting our base mana pool or any other items besides these two). Not bad. We have +20 AD and +60 AP. Let's see how much bonuses we're getting.
Muramana: Bonus AD equal to 2% of our maximum mana = (0.02) x (2000) = 40 Bonus AD
Seraph's Embrace: Bonus AP equal to 3% of our maximum mana = (0.03) x (2000) = 60 Bonus AP
Now, at 2000 mana we have 20 AD and 60 AP, with a 40 AD bonus and a 60 AP bonus. That puts us at 60 total AD from Muramana and 120 AP from Seraph's Embrace. However! You say how much will we have at 4000 and 6000 mana. Let's find out.
Currently, we have +4000 mana (Again, not counting our base mana pool or any other items besides these two). We have +20 AD and +60 AP. Let's see how much bonuses we're getting.
Muramana: Bonus AD equal to 2% of our maximum mana = (0.02) x (4000) = 80 Bonus AD
Seraph's Embrace: Bonus AP equal to 3% of our maximum mana = (0.03) x (4000) = 120 Bonus AP
At 4000 mana we have 20 AD and 60 AP, with an 80 AD bonus and a 120 AP bonus. That puts us at 100 total AD from Muramana and 180 AP from Seraph's Embrace. Let's see at 6000 mana.
Currently, we have +6000 mana (Again, not counting our base mana pool or any other items besides these two). We have +20 AD and +60 AP. Let's see how much bonuses we're getting.
Muramana: Bonus AD equal to 2% of our maximum mana = (0.02) x (6000) = 120 Bonus AD
Seraph's Embrace: Bonus AP equal to 3% of our maximum mana = (0.03) x (6000) = 180 Bonus AP
At 6000 mana we have 20 AD and 60 AP, with a 100 AD bonus and a 180 AP bonus. That puts us at 120 total AD from Muramana and 240 AP from Seraph's Embrace.
Well, I hoped that answered your question. Keep in mind, in game numbers will be slightly larger because your champion will have a base mana pool to accompany the bonus mana you receive. Also, keep in mind this really isn't viable. With that, see you out there, fellow Summoner.
Actually the extra 2000 mana is a unique passive, so you would still only get +2000 mana with both, although you will still get the %AP and %AD from both. And it wouldn't be too practical, as to get both you would have to finish one and then start the second from scratch (as only one will charge at a time)
iirc when they were originally released, a lot of experiments were run on what happened if you had both 
and 
. The first thing that was found was both charged at the same time (though since 
's passive is UNIQUE, it only applied once). The second thing that was found was that if you own both when you hit 750 stacks, takes priority and transforms into leaving your at 0 stacks that you would have to refill from scratch. The third thing that was found is that there is NO reason for that to be necessary on ANYONE. I know there's 
, but by the time you get a 2nd ToG filled, you could've just gotten 
or another 
.
