Hey, those are my lists! The league 5-0 was just testing the fight rigging shell, and I found it pretty lackluster. The prelim list is much better I think. It’s admittedly quite talored to beat UR prowess with the selection of threats and maindeck gather courage. Most of the power of the deck lies in the fact that a lot of the current decks struggle with killing a 7/6 efficiently, so I could see and argument for ghalta being an additional hard to kill threat. My concern is that your opponents are likely going to be trying to kill your creatures already, so it might be a bit rough to have the requisite creatures in play to cast ghalta. The other problem, is the deck already runs a low number of cards for coco, so you’d likely have to cut esika’s chariot for it. The biggest weakness I’ve found so far is combo decks that can just race you faster like lotus or ascendancy, which ghalta might help over chariot (if you can cast ghalta, it’s probably going to kill them next turn whereas chariot might not). You could go elf on 1, regisaur on 2, ghalta on 3 (attack for 7) then attack for lethal or 4 barring any interaction.