Karn, the Great Creator + Pemmin's Aura + Empowered Autogenerator

Karn, the Great Creator

Pemmin's Aura

Empowered Autogenerator

How it works

1. Activate Karn's first loyalty ability, causing Empowered Autogenerator to become an artifact creature until end of turn.
2. Cast Pemmin's Aura by paying 1, enchanting Empowered Autogenerator.
3. Activate Empowered Autogenerator by putting a charge counter and tapping it, adding equal to charge counters on Empowered Autogenerator.
4. Activate Pemmin's Aura by paying , untapping Empowered Autogenerator.
5. Repeat from step 2.