I made one with 6 - 14" flat tines cut from 1/4" Steel plate.
The handles are over 5feet tall so it has great leverage.
I prepare the soil only once with it.
It is a bit slow on hard soil but easier on the back.
We put down,
compost, some rock dust, maybe kelp, soaked char, little granite dust and matured manure if needed. Sometimes bonemeal too.
The soil is just broken through the added amendments
It is then watered, mulched and left to the earthworms
to create tilth, mix all and improve fertility.
We keep thick mulch over it as much as possible.