| Teller of Tales |
It does say "damage die" and not "weapon damage die", so I would say yes since SA etc. are part of your damage roll.
That would mean taking it once is (on average) +0.83 damage per sneak attack die (taking it a second time is already only +0.66 damage).
Quite strong, but hardly overpowered considering we are speaking about a rogue here and compared to some other things (a level 20 rogue/10 mythic would get less than 14.5 Damage per attack more than someone else taking it twice. A level 20 Monk/10 Mythic who takes Mythic Imp. Unarmed and Titan Strike gets 13.5.)
If it wouldn't work for SA, then it would actually be weaker for rogues than for, say, a Greatsword fighter despite being Trickster Path.