Short idea
Mc reincarnates in soul land or dalou dalou with a block of minecraft dirt as his soul. When his soul awakens he gets a basic minecraft ui.
To cultivate you have to fill up the minecraft exp bar, every ten minecraft levels grants a permanent 1 level increase in soul power so at level 100 in the minecraft exp bar your soul power will be 10.
Your physique is the same as a minecraft character just not square haha. You get exp through all the normal minecraft ways and can use the stored exp for the enchantments.
You can also get exp for crafting things, the better the object crafted the more exp. You also get exp for completing buildings, the better the building( creativity, size, usefulness, mystery etc) the more exp.
If a building that you make becomes famous across the land you gain perks. For example you build a massive tower out of earth early on and it becomes known as the mysterious earth tower, this gives you a perk that lets you convert minecraft exp into soul ring age.
Each soul ring gives you access to one chosen mod in addition to whatever offensive power it gives. Also each soul ring changes your block, for example the second soul ring changes it too wood, the third stone etc up to bedrock.
You can freely change your block and using soul power provides you with infinite block of your material type until you run out of soul power.
Block placed by you act on minecraft physics. Also when placing a gold block down it is literally a 1 meter by 1 meter solid block of gold, the same for diamond etc. so eventually money won't be an issue.
You can do some funny stuff with this, example you make a massive tower that touches the clouds and you, somehow, imbue the effect of truth potions into the giant glow stone block at the top, this makes everyone on that continent always speak the truth.
The chaos that would cause,
"I love you tang hao" said Ah yin
"I want your spirit bone" replied tang hao
Haha depending on what time period you choose you can have all kinds of fun.
Have fun.