Halo Fountain + Vedalken Engineer + Karn, Silver Golem

Halo Fountain

Vedalken Engineer

Karn, Silver Golem

How it works

1. Activate Karn by paying 1, causing Halo Fountain to become an artifact creature until end of turn.
2. Activate Vedalken Engineer by tapping it, adding that can only be spent to cast artifact spells or activate abilities of artifacts.
3. Activate Halo Fountain's second ability by paying , tapping it and untapping Halo Fountain and Vedalken Engineer, causing you to draw a card.
4. Repeat from step 2.