Sword of the Meek, Thopter Foundry, and Urza, Lord High Artificer

Prerequisites

• Sword of the Meek on the battlefield
• Thopter Foundry on the battlefield
• Urza, Lord High Artificer on the battlefield

Steps

1. Activate Urza's first ability by tapping Sword of the Meek, adding
2. Activate Thopter Foundry by paying and sacrificing Sword of the Meek, creating a 1/1 Thopter creature token with flying and causing you to gain 1 life
3. The Thopter enters the battlefield, triggering Sword of the Meek, causing you to return Sword of the Meek from your graveyard to the battlefield attached to the Thopter
4. Repeat
5. Once you have an infinite amount of Thopter tokens, you may tap them using Urza's first ability to get infinite , and then use the mana to activate Urza's second ability infinite times

Results

• Cast all cards in your library without paying their mana costs
• Infinite blue mana
• Infinite creature tokens
• Infinite ETB
• Infinite lifegain
• Infinite lifegain triggers