Retrofitter Foundry, and Mana Echoes

Prerequisites

• Retrofitter Foundry on the battlefield
• Mana Echoes on the battlefield
• plus up to additional depending on the number of Servos you control available

Steps

1. Activate Retrofitter Foundry's second ability by paying and tapping it, creating a 1/1 Servo artifact creature token
2. When the Servo enters the battlefield, Mana Echoes triggers
3. If you control less than three Servos, activate Retrofitter Foundry's first ability by paying , untapping it
4. If you control less than three Servos, repeat from step 1 until you control three Servos
5. Resolve all Mana Echoes triggers, adding for each Servo you control for each trigger
6. Activate Retrofitter Foundry's first ability by paying , untapping it
7. Activate Retrofitter Foundry's second ability by paying and tapping it, creating a 1/1 Servo artifact creature token
8. When the Servo enters the battlefield, Mana Echoes triggers, adding for each Servo you control
9. Repeat from step 6
10. Once you have infinite mana, you may use Retrofitter Foundry's other abilities

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite creature tokens