Ezuri, Renegade Leader, Devoted Druid, and Leyline of Abundance

Prerequisites

• Ezuri, Renegade Leader on the battlefield
• Devoted Druid on the battlefield
• Leyline of Abundance on the battlefield
• Devoted Druid does not have summoning sickness
• Devoted Druid does not have any -1/-1 counters on it
• available

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 gain trample until end of turn
5. Activate Devoted Druid's second ability by putting a -1/-1 counter on it, untapping it
6. Activate Devoted Druid's first ability by tapping it, adding
7. Activate Devoted Druid's second ability by putting a -1/-1 counter on it, untapping it
8. Repeat

Results

• Infinite +1/+1 counters
• Infinite green mana
• Infinitely large Elves until end of turn