Making a note to test Grisly Sigil in the Vicious Offering spot. It keeps the sacrifice synergy of the offering while also providing life gain.

Might be better to swap out nightmare thirst, but I think the two of them have different enough applications and synergies that they're interesting enough as separate picks.

This might put a damper on adding more aggressive creatures to the color, like Arrogant Poet. It might put too much life gain into black, but feedback is that the black lifegain payoffs don't seem good enough for the risk they represent, so maybe putting in a touch more life gain at the expense of maximum creature destruction is acceptable.