Horseshoe Crab, Cryptolith Rite, and Leyline of Abundance

Prerequisites

• Horseshoe Crab on the battlefield
• Cryptolith Rite on the battlefield
• Leyline of Abundance on the battlefield
• Horseshow Crab does not have summoning sickness

Steps

1. Activate Horseshoe Crab's ability from Cryptolith Rites by tapping it, adding
2. Leyline of Abundance's second ability triggers, adding
3. Activate Horseshoe Crab's own ability by paying , untapping it
4. Repeat any number of times
5. Once you have infinite green mana, you may activate Leyline of Abundance's last ability any number of times

Results

• Infinite +1/+1 counters on all creatures you control
• Infinite green mana