Sydri, Galvanic Genius, Halo Fountain, and Chromatic Orrery

Prerequisites

• Sydri, Galvanic Genius on the battlefield
• Halo Fountain on the battlefield
• Chromatic Orrery on the battlefield
• Halo Fountain and Chromatic Orrery do not have summoning sickness
• available

Steps

1. Activate Sydri's first ability by paying , causing Halo Foutain to become a creature
2. Activate Sydri's first ability by paying , causing Chromatic Orrery to become a creature
3. Activate Chromatic Orrery's first ability by tapping it, adding
4. Activate Halo Fountain's second ability by paying and tap, untapping Chromatic Orrery and itself
5. Repeat from step 3

Results

• Infinite card draw
• Infinite colored mana
• Infinite colorless mana