Mulligans
Combo Mulligans
Provided you survive through your opponents two turns, Velen plus any combination of these and Anduin's hero power should be enough to machine gun your opponent down from nearly any health total. And unlike pre-nerf Raza, your opponent knows they have to get lethal in their two turns otherwise they're gonna die!
This is probably an awful deck. The idea here is to lock down the mid and late game with your deathrattle taunts while you assemble the combo pieces, using Velen over the course of two turns to 2TK your opponent thanks to Temporus. Taunts + Amara (and double Amara using Zola) help you avoid a 2 turn lethal from your opponent. Mirage Caller and Vivid Nightmare can also help you complete the quest faster. This also solves the problem of Awaken the Makers not having a win condition in it.
The biggest possible wombo-combo is 5 Velens: Velen, 2 Mirage Callers, and 2 Vivid Nightmares, allowing a single Holy Smite do deal 64 damage. At mimum, a single Velen + Shadowreaper, Holy Smite, and Mindblast over the course of two turns and 20 mana should be enough to machine gun your opponent down.
Coffin Crasher might be a great addition too, allowing you to get an Obsidian Statue out a little sooner. This deck also lacks AoE, so either a spell from the Witchwood or a small Dragon Package utilizing Duskbreaker could be used depending on what gets revealed. Other options include Gilded Gargoyle to get some coins for combos, or eschewing card draw deathrattles altogether so that Twilight’s Call is guaranteed to bring back 1/1 taunts (the goal here is to grind your opponent out of resources before dropping the combo, after all).
All in all, there’s a lot of things that could change in this list, especially once all the cards are revealed. Will it ever work or be viable in any meta? Probably not. But I’m going to try it!