No More Mana

How do we get rid of Mana?

Idea 1: System 6 style

Normal powers, you roll your dice, stuff happens, the end. Infinite magic (within reason).

When you want to try metamagic (or Big Magic), you have to roll some sort of skill check, and, on failure, you suffer Strain.

Potential issues:

Idea 2: PbtA

Use PbtA-style rolls.