i need a good way to make money on oasis
My strategy on Aztec is to make a wheat or sugar cane farm (Probably sugar cane since its easier to tell when its done and harvestable) and then go to a public grinder warp and grind some heads and mob drops. (You can switch your attack button to space and jump to click so you can hold the button down and kill faster ― just don't go afk or not look at the screen, or mods can consider it auto clicking.)
Once you grind up mob heads, you can sell them for extremely high prices (I think oasis has it at 5m per stack?) And sell the mana you earn until you actually need it. A good way to get mana is from /slayer (which you receive by using /kilton, trade a head for a soul. Mobs drop their head 1/10 times).
Until you need the mana, don't worry about it. Mana is used in /is upgrades, primarily, and also /rankup. Once you save up enough, immediately go for creeper spawners. I think /AH will sell them for much cheaper than /shop by the stack.
Happy earnings!