It sort of depends on the rest of your team. If you run Raudhraven (a pretty good idea since Cymbeline isn't that good aside from 16 Might), Triangle Adept allows you to reach absurd levels of firepower against both Green and Colorless. More importantly, it greatly reduces the damage Sanaki takes from those two colors to negligible/nonexistent levels, which improves her sustain. Losing damage against Blue doesn't really hurt her, because she's not supposed to be fighting them anyway; when building your team, you're supposed to have a separate and dedicated Blue counter on board anyway. Some people build an entire team of three TAs with one Dancer and it works great.
Of course, if you don't find the need for this sustain (due to your team comp, or whatever reason), or you wish to run Cymbeline instead, Death Blow 3 is an alternative. L&D doesn't help her too much since her Spd doesn't get that much better, and she likes having huge Res.