Ymir is here!

Item stats at maximum stacks:
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Doom Orb - 150 Magical power, 200 Mana
Warlock's Sash- 110 Magical power, 600 Health, 400 Mana
Book of Thoth - 100 Magical power, 875 Mana
Soul Reaver - 100 Magical power, 300 Mana
Ethereal Staff - 30 Magical power, 600 Health, 300 Mana
Rod of Tahuti - 125 Magical power
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Totalling 615 Magical power.
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At level 20 with those stacks, Ymir's
Health - 3790
Mana - 2915
Book of Thoth giving an additional 87.45 (0.03*2915) Magical power
Ethereal Staff giving an additional 75.8 (0.02*3790) Magical power
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Bringing the total to 778.25
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The Potion of Magical Might granting an additional 50 Magical Power
The Fire Giant buff granting an additional 70 Magical power
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Total is now 898.25
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% buffs
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Elixir of Power - 25%
Rod of Tahuti - 25%
Jungle Damage Buff - 20%
Girdle of Inner Power - 20%
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For a combined total of 90% additional power.
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The grand total is 1706.675 Magical power, displayed as 1707.
Ymir's ultimate deals 1100+150% at max channel
A total possible of 3660.0125 damage.
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Other notes
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Bancroft's talon can give up to 199 power, but it's damn near impossible to get a god down that low and keep them there, especially with the FG buff's passive health regen
I deliberately limited myself to 1 FG buff
On that note, add an additional 133 power for every fire giant buff
As far as I can tell, this is the most damage you can possibly get on a single tick of damage with just one god (barring the infinitely stacking fire giant buffs)
Furies have exactly 1 protections. I know that reads funny but you get what I mean