Devoted Druid, and One with the Stars

Prerequisites

• Devoted Druid on the battlefield
• One with the Stars on the battlefield
• One with the Stars attached to Devoted Druid

Steps

1. Activate Devoted Druid by tapping it, adding
2. Activate Devoted Druid by putting a -1/-1 counter on it, untapping it
3. Repeat

Results

• Infinite green mana