Earthcraft + Halo Fountain + Karn, the Great Creator

Earthcraft

Halo Fountain

Karn, the Great Creator

How it works

1. Activate Karn's first loyalty ability by putting a loyalty counter on it, turning Halo Fountain into an artifact creature until end of turn.
2. Activate Earthcraft by tapping an untapped creature you control, untaaping a basic Plains you control.
3. Activate a basic Plains you control by tapping it, adding .
4. Activate Halo Fountain by tapping and untapping itself, creating a 1/1 creature token.
5. Repeat from step 2.