Cayth, Famed Mechanist, Mana Echoes, and Glamermite

Prerequisites

• Cayth, Famed Mechanist on the battlefield
• Mana Echoes on the battlefield
• Glamermite on the battlefield
• available

Steps

1. Activate Cayth by paying and tapping it, creating a copy of the Glamermite token
2. When the Glamermite token enters the battlefield, it and Mana Echoes trigger
3. Resolve the Glamermite trigger, untapping Cayth Resolve the Mana Echoes trigger, adding for each creature you control that shares a type with the Glamermite token
4. Repeat

Results

• Infinite ETB
• Infinite colorless mana
• Infinite creature tokens