Eyes of the Vestige gives me a ranged psychic at will that also allows me to curse a target. Also, with the d9 vestige of Ilmeth up, Eye will additionally inflict a -2 penalty to hit until EoNT. (In addition the Ilmeth Pact boon allows me to swap places with an ally within 5 squares).As for other vestiges, King Elidyr, while mediocre, isn't total crap for a defender. I haven't scrutinized the other vestiges available to me over lvl13 to closely at this point, so I don't have much to offer there. We've had a bit of a party shift, leaving me as the sole defender (and basically the frontline, though the warlord isn't THAT squishy). Leaders are a bard, and a lazylord and possibly something else (our former paladin is making a new character that might be a shaman or might be a druid). The rest of the party consists of a brutal scoundrel and a rotating cast of two wizards (a pyromancer and a necromancer) and a chaos sorcerer. My gut says I can probably abuse Sigil Carver more, but Umbral cabalist has some nice features and powers.
And thus the issue I have with the Artificer Guide currently, A and D are the same, and there's all of 2 powers that meet those requirements, so the optimal everything is either B or C, which is like 75% of their total list, varrying by party/campaign nuances, bleh.SM|Lock is easy though, Sigil Carver is definitely the right choice, you've got 2 leaders and a striker that are typically favored targets by DMs everywhere, added punishment is spiffy.