Ezuri, Renegade Leader, Devoted Druid, and Nyxbloom Ancient

Prerequisites

• Ezuri, Renegade Leader on the battlefield
• Devoted Druid on the battlefield
• Nyxbloom Ancient on the battlefield
• All permanents do not have summoning sickness

Steps

1. Activate Devoted Druid's first ability by tapping it, adding
2. Activate Devoted Druid's second ability by putting a -1/-1 counter on it, untapping it
3. Activate Devoted Druid's first ability by tapping it, adding
4. Activate Ezuri's second ability by paying , causing all Elves you control to get +3/+3 and trample until end of turn
5. Activate Devoted Druid's second ability by putting a -1/-1 counter on it, untapping it
6. Repeat

Results

• Infinite green mana
• Infinitely large Elves until end of turn