Priest of Titania, and Umbral Mantle

Prerequisites

• Priest of Titania on the battlefield
• Umbral Mantle on the battlefield
• Umbral Mantle attached to Priest of Titania
• You control at least three other Elves
• Priest of Titania does not have summoning sickness

Steps

1. Activate Priest of Titania by tapping it, adding at least
2. Activate Priest of Titania by paying and untapping it, giving itself +2/+2 until end of turn
3. Repeat

Results

• Infinitely large Priest of Titania until end of turn
• Infinite green mana