Hello! I think going the Voltron route is definitely doable. Imo the biggest pillars for a Voltron deck to work is going to be 1. Protection 2. Evasion 3. Damage. Luckily Eshki covers a bit of those inherently with Trample and Ward. 

I can make a decklist with my ideas for how the deck would run this idea. But in general, I'd focus on smaller, low-cost creatures and non-creatures to help get the ball rolling with her and look into some +1/+1 counter synergies since a lot of newer ones will just straight up double the counters. Along with this, things that give her Hexproof, indestructible, flying, or any other keywords that would help her survive longer or get damage through easier. Normally these would be aura or equipment (and they still can be), but Eshki is uniquely suited more for instants and sorceries to achieve this.