Death Strike and Obliterate both use 1x Frost + 1x Unholy runes.
Blood Strike (1x Blood) regenerates as Death Runes.

Trying to come up with a spammable macro, as Frost.
Which will cycle through repeatedly.
Not having too much luck, as Frost randomly refreshes some runes.
Not sure if it sometimes uses Death Runes and other times uses a fixed rune.
Free Frost Strike procs also mess it up, would want a sequence that assumes no Frost Strike procs.

Alternatively, could go with a spammable pseudo priority system, similar to the HB - FS - NS - BS spam.
That might be the way to go.

Ideally:
Obliterate/Death Strike > Blood Strike > Frost Strike

Haven't had luck with:
/castsequence One, Two
/cast Frost Strike (as a fall-through)
... maybe because every ability is instant; this works when the castsequence is spells with cast times.

Search hasn't yielded much.
Anyone have a spammable macro, for Obliterate and/or Death Strike?
They use the same runes, so theoretically could be mixed and matched.