To convert to Modern-friendly:

Savannah's become Temple Garden
Tundra becomes another Hallowed Fountain
Tropical Island becomes another Breeding Pool or Island or maybe Flooded Strand?

Brainstorm becomes Track Down
Swords to Plowshares becomes two more Path to Exile
Lotus Petal becomes ...

Could also substitute the Track Down-type spells for 2CMC creatures that give card draw on ETB.

want to get 2 Arcbound Ravagers in here, too, I think to also act as a sort of Ozolith back to Ballista and Lizrog and another offensive and counter-generating weapon

Chromatic Stars should be swapped in, too, so you get a card even if you sac it to a ravager