Devoted Druid, Leyline of Abundance, The Earth Crystal, and Benevolent Hydra

Prerequisites

• Devoted Druid on the battlefield
• Leyline of Abundance on the battlefield
• The Earth Crystal on the battlefield
• Benevolent Hydra on the battlefield
• available

Steps

1. Activate Leyline of Abundance by paying , putting four +1/+1 counters on each creature you control due to The Earth Crystal and Benevolent Hydra
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