Hazel's Brewmaster, and Devoted Druid

Prerequisites

• Hazel's Brewmaster on the battlefield
• Devoted Druid in exile

Steps

1. Activate a Food using Devoted Druid's first ability by tapping it, adding
2. Activate a Food using Devoted Druid's second ability by putting a -1/-1 counter on it, untapping it
3. Repeat

Results

• Infinite green mana