Here's a version of the non-glyphed Horn of Winter macro that checks to see if it's actually usable so you don't accidentally click off the buff if you have twitchy fingers and mash buttons many times (possibly in futile attempts to defy latency issues or because of high caffeine consumption, or because of some other personal issue.)

And some macros I have been using tentatively for twisting Sigils between [Sigil of the Unfaltering Knight] and [Sigil of Awareness] (We could probably factor in [Sigil of the Frozen Conscience] somewhere as well, possibly replacing Unfaltering Knight but for now I'll just stick with these two):

The lua code simply makes sure the Sigil doesn't push back your GCD by more than 10 milliseconds and that you've actually used something to trigger a cooldown on the current ability, else it won't switch (allowing for more button mashing and facerolling without undesirable effects).

I replace Icy Touch with the macro altogether and use the Obliterate one with a key modifier on the last Obliterate in my rotation. Because of the consistency and predictability of most rotations, it's appearing to work out quite well. And since all of the abilities we'd want to macro a Sigil switch to are instant, there are really no drawbacks I can think of.

Ok I thought of something like these

#show..
/cast Death Grip
/stopmacro [mod]
/cast Dark Command

or

#show..
/cast Death Grip
/cast [mod] Dark Command

But as there is no mod in the Macro LUA I know that checks if targettarget=player. As this won't function we need get back to /run (/script). Preposter Magic gave the basics anyway so credit goes to him pointing in that direction. What I will be testing looks like this:

I thought they had removed the ability to "if x then cast". Let us know if you found something, but I highly suspect that macro won't work right.

#showtooltip
/cast [modifier:shift] Death Coil; Frost Strike

should work imo.

Edit:
I thought about this macro to cast Raise Dead or Raise Ally, depending on my target.

#showtooltip Raise Dead
/cast [target= friendly, dead] Raise Ally(Rank 1)
/run [target=friendly, dead] SendChatMessage("You are a Ghoul, mon!","WHISPER",nil, UnitName("TARGET"));
/stopmacro [target=friendly, dead]
/cast Raise Dead(Rank 1)

I currently have:

Heal the ghoul
#showtooltip
/cast [target=pet] Death Coil

Heal yourself with death coil (requires Lichborne T3 Frost)
#showtooltip
/castsequence [target=<put your nick here>]Lichborne, Death Coil, Death Coil, Death Coil

Pestilence then Blood Boil - wrote recently as the lack of cooldown on Pestilence causes me to not notice that it's been triggered and I could Blood Boil. It should be noted that I got a strange response when I triggered this the first time and may need to tinker with it further.
#showtooltip
/castsequence reset=9 Pestilence, Blood Boil


There may be typos.

EDIT: Pestilence then Blood Boil works fine. Reset was lengthened to the maximum I thought needed (if you DnD then Pestilence on a pull). However, you should set it for less if you can.

My understanding is that macros under modifiers will cast everything inside the modifier, then nothing outside the modifier.
Essentially a /cast deathchill /cast HB works. When you add the modifier to deathchill, the HB needs a modifier as well. With your example, to do deathchill AND hb (assuming keybind 1):
(shift)1 1. You need to hit the key twice, once with and once without modifier.
With my macro, it will cast BOTH with 1 press. since deathchill has no gcd.

Onto the Death Grip/Dark Command Macro. I found a way that works for me (addon wise) but running a single button macro is not available as every function I knew from my scripting days is now protected or not running the needed modifier. I will still see if I find something in my days off WoW but seem I have a lot to lookup what is still available.

@rei-gouki
Would not [target=player] be enough instead of [target=<name>]

Just a warning, for me that macro sometimes made taunt not work somehow. Ie. DG would be on cd, taunt off cd, and still if I pressed it nothing would happen (no taunt as opposed to what you would expect). Maybe I spammed it too much, dunno /shrug

/castsequence [target=player] Rune Tap, Berserking, Hysteria, Dancing Rune Weapon, Empower Rune Weapon, Raise Dead


if you're not a troll, remove Berserking from the macro. you might want to consider rerolling too.

raise dead is usually on cooldown when i use this macro, but I put it at the end just in case it's not. I typically cast Raise Dead around 66% on a boss, then spam this macro at 40% (or whenever I get bloodlust)

Rune Tapping before Berserking seems like a poor idea.

really the only reason i start with Rune Tap is because it has the shortest cooldown and the macro was behaving weirdly when longer cooldown abilites were in front. i'm kindof a newb at macros so i just hacked it that way. my health is very rarely low enough that i would gain anything greater than the base 10% from berserking, so i'm ok with it.