Halo Fountain, Vedalken Engineer, and March of the Machines

Prerequisites

• Halo Fountain on the battlefield
• Vedalken Engineer on the battlefield
• March of the Machines on the battlefield
• Vedalken Engineer and Halo Fountain do not have summoning sickness

Steps

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

Results

• Infinite card draw
• Infinite draw triggers