Basically the title...if you have Reyna, Sage, and Skye on the same team and the other team has a Sage how much damage could Reyna take? I just did some quick thinking and Sage can heal 3 times in one round plus use her Ult. Skye can obviously heal for 100. And Reyna can Ult to heal from 1 hp to 150 hp. Put that all together...

Starting HP 150 + 3 Sage heals (60 each) + Skye (99 max) + Sage Ult (back to 100 hp) + 6 possible kills in a round (149 x 6 = 894) = 1,423 possible damage in a round

If I missed anything or time constraints would make something I said impossible, let me know.

EDIT: I forgot about taking spike damage for an additional 999 for a total of 2,422 damage in a round!

Thanks to u/nvrslnc

EDIT 2: I believe we have found the answer, thanks to u/Geronimobius for putting it in a clean spreadsheet. However, Skye can heal you up to 100 in a single round, so the answer is actually 1 hp higher lol.

This brings the total theoretical limit to 2,837 HP

EDIT 3: Thanks to u/derpofanboy for testing vulnerability plus spike damage...so damage from spike can now be doubled to 1,998 HP.

This brings us to a grand total of 3,836 damage in a single round! Hahaha thanks everyone for running with this funny thought experiment.