Devoted Druid, Leyline of Abundance, Hardened Scales, and Primal Vigor

Prerequisites

• Devoted Druid on the battlefield
• Leyline of Abundance on the battlefield
• Hardened Scales on the battlefield
• Primal Vigor on the battlefield
• available

Steps

1. Activate Leyline of Abundance by paying , putting four +1/+1 counters on each creature you control due to Hardened Scales and Primal Vigor
2. Activate Devoted Druid's first ability by tapping it, adding
3. Leyline of Abundance triggers, adding
4. Activate Devoted Druid's second ability by putting a -1/-1 counter on it, untapping Devoted Druid
5. Repeat from step 2 three additional times
6. Repeat from step 1

Results

• Infinite +1/+1 counters on most creatures you control