Marvin, Murderous Mimic, Farmstead Gleaner, and Selvala, Eager Trailblazer

Prerequisites

• Marvin, Murderous Mimic on the battlefield
• Farmstead Gleaner on the battlefield
• Selvala, Eager Trailblazer on the battlefield

Steps

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

Results

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