So what happens when a Veigar ults another Veigar who is ulting the first Veigar?
^
^
they both die.
or whoever has zhonya's lives.
THEY DIE
Cause it burns them alive?
I'm not 100% sure, but I think if they're both using the leprechaun skin then it makes a double rainbow. Of Death. And Doom.

[slayer-pantheon-rainbows]
[zombie-brand-mindblown]
And then both teams get aced, all the towers fall, and then the nexus, all at the distance from the blast radius, meaning its possible for one nexus to blow up before the other...
The one with the better skin survives
Complete annihilation and the game crashes [slayer-pantheon-thumbs]
Bugsplat. [slayer-jinx-catface]