This is an established deck in the format, but I have an alternate deck list which doesn't require to buy 4 copies of Mox Diamond, since they are insanely expensive.
"Terra-Geddon"
4 Terravore
4 Exalted Angel
4 Llanowar Elves
4 Fyndhorn Elves
4 Birds of Paradise
4 Werebear
4 Armageddon
4 Winter Orb
2 Sylvan Library
2 Naturalize
Land (24)
10 Forest
10 Plains
4 Brushlands
Sideboard
4 Tormod's Crypt
2 Naturalize
3 Compost
4 Ravenous Baloth
2 something else, not sure yet.
Pros: You recover from Armageddon way faster than opponent due to having 16 "Mana-dorks" in the deck.
Werebear can get Threshold following an Armageddon, making it a 4/4 for just 1G mana cost.
There are 12 total win conditions in this version of the deck.
Winter Orb also combos very well with Mana-dorks.
Cons: Your opponent will rage quit if and when they lose.
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Blowing up all the lands and still winning feels evil… in a fun way 😈
Your list is absolutely playable in Premodern as a budget Terra-Geddon. Mana dorks plus Winter Orb and Armageddon is a brutal package, and Terravore/Angel close games fast. You’ll be a bit weaker to removal without Mox Diamond’s speed and fixing, but the core game plan still works.
I’d just test different “something else” sideboard cards for your meta, like extra removal or protection. Have fun making people scoop 😅