Llanowar Tribe, Umbral Mantle, and Leyline of Abundance

Prerequisites

• Llanowar Tribe on the battlefield
• Umbral Mantle on the battlefield
• Leyline of Abundance on the battlefield
• Umbral Mantle attached to Llanowar Tribe
• Llanowar Tribe does not have summoning sickness

Steps

1. Activate Llanowar Tribe by tapping it, adding
2. Leyline of Abundance triggers, adding
3. Activate Llanowar Tribe by paying and untapping it, giving itself +2/+2 until end of turn
4. Repeat

Results

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