In Oblivion, the player would earns skills based on the level of their skills. The only mod that I found that changes this (ASAP - Automatic Perks and More) is rather buggy and limited.

So, I am new to creation kit, but I am still gonna try. Does anyone know a condition that will add a perk when the player reaches a certain level. For example; the Dark Souls perk has the conditions:

Run on target: Has Perk: Necromancy == 1 AND

Run on target: Get base actor value: Conjuration >= 70 and

So if I remove the first condition will the perk be added once the player has a conjuration level of 70 or higher?
If not can someone tell me how I would go about changing this.

The player can only use a perk they're given. Story Manager has an event node for when the player increase their level, so you could look into that. Although time consuming, what you're wanting to do is fairly simple once you understand story manager.