Marvin, Murderous Mimic, Farmstead Gleaner, and Viridian Joiner

Prerequisites

• Marvin, Murderous Mimic on the battlefield
• Farmstead Gleaner on the battlefield
• Viridian Joiner on the battlefield

Steps

1. Activate Marvin using Viridian Joiner's ability by tapping it, adding at least Activate Marvin using Farmstead Gleaner's ability by paying and untapping it, putting a +1/+1 counter on Marvin
2. Repeat

Results

• Infinite green mana
• Infinite +1/+1 counters on a creature