I've been goldfishing pure ramp + Villainous Wealth. It seems it might be pretty explosive... if you can draw a Villainous Wealth. Dig Through Time helps here (the deck doesn't really have problems hardcasting it), but there's still the risk of just ramping into nothing. Mulliganing doesn't really help, since it needs all the cards it can get.
My record so far is X = 40 on turn 5 (Nykthos + Verdant Haven/Market Festival + Voyaging Satyr/Kiora's Follower will do things like that). Turn 5 appears to be the sweetspot of ramping enough to cast it for a good amount.
It probably won't be nearly as hilarious in actual games (where stuff like Anger of the Gods is a thing), but I'm sure it will go off often enough to be worth playing for fun.
T1 Forest, Elvish Mystic (1 devotion)
T2 Nykthos, Voyaging Satyr, Elvish Mystic (3 devotion)
T3 Verdant Haven on Nykthos, Voyaging Satyr (5 devotion)
T4 Verdant Haven on Nykthos (6 devotion), tap Nykthos for 3, Voyaging Satyr Nykthos, use 2 to make 8 mana (9 mana total), Voyaging Satyr Nykthos again, use 2 to make 8 mana (15 mana total), Dig Through Time finding Market Festival and Villainous Wealth (7 mana left), Market Festival on Nykthos, Voyaging Satyr (8 devotion)
T5 Nykthos is now +10 mana (8 devotion + 2 Verdant Haven + Market Festival). Elvish Mystic x2 + Forest = 3 mana, Nykthos -> 13 mana, Voyaging Satyr x3 -> 43, Villainous Wealth for X = 40