Channeler Initiate + Sinking Feeling + Nest of Scarabs

Channeler Initiate

Sinking Feeling

Nest of Scarabs

How it works

1. Activate Channeler Initiate by tapping and removing a -1/-1 counter from it, adding one mana of any color.
2. Activate Channeler Initiate by paying 1 and putting a -1/-1 counter on it, untapping it.
3. Nest of Scarabs triggers, creating a 1/1 Insect creature token.
4. Repeat.