Urza, Lord High Artificer, Pili-Pala, and Leyline of Abundance

Prerequisites

• Urza, Lord High Artificer on the battlefield
• Pili-Pala on the battlefield
• Leyline of Abundance on the battlefield

Steps

1. Activate Urza's first ability by tapping Pili-Pala, adding
2. Leyline of Abundance triggers, adding
3. Activate Pili-Pala by paying and untapping it, adding one mana of any color
4. Repeat
5. Once you have infinite mana, you may use it to activate either Urza or Leyline of Abundance's abilities

Results

• Cast all cards in your library without paying their mana costs
• Infinite +1/+1 counters
• Infinite colored mana
• Near-infinite storm count
• Exile your library