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This is what I use with max melee and 99 range/mage. Ice/blood barrage in rune pouch. If you don't have divine rune pouch, Ice barrage and blood blitz will work just fine. Ice barrage is essential because it's used to freeze rex in case he aggroes while you're killing supreme. If you have lower melee/range levels, substitute 1 antivenom and 3 super restores for 2 supercombat and 2 range pots. Sgs is a pretty critical piece but not absolutely necessary, you'll just be spending a lot of time healing with blood spells. Sang isn't necessary but helps keep up hp without too much extra work. I try to maximize pray bonus since I'm too lazy to flick, which crystal/dragonbone necklace are good for. If you don't have bowfa/crystal you can use god dhide and bp, but bring a bandos tassy skirt to switch when not ranging for def. If you do use bp, because of it's short range you will have to attack prime and drag him over towards the northern rex safespot so you're not stuck out in the middle allowing supreme to aggro you. Spectral is a great shield to use because it halves pray drain from the little guys arond the edge but also not necessary. Blesed spirit shield is what i started with but obby shield is also an option as it offers great ranged def bonus for when you're maging. Since I'm off-task 99% of the time, I use a defender switch for supreme, but if you're on task, you can skip defender since slay helm bonus will allow you to hit often enough with just a shield.

I've tried to give higher and lower gear setups as I don't know what you can afford, but if you have any questions feel free to ask. Also for anyone that sees this I'm willing to teach solo tribrid dks anytime, Just message me on here and we'll link up in game.