Grand Architect, Heartless Summoning, Sword of the Meek, and Thopter Foundry

Prerequisites

• Grand Architect on the battlefield
• Heartless Summoning on the battlefield
• Sword of the Meek on the battlefield
• Thopter Foundry on the battlefield
• available

Steps

1. Activate Thopter Foundry by paying and sacrificing Sword of the Meek, creating a 1/1 Thopter artifact creature token and causing you to gain one life
2. When the Thopter enters the battlefield, Sword of the Meek triggers, returning it from your graveyard to the battlefield attached to the Thopter
3. Activate Grand Architect's second ability by tapping the Thopter, adding that can only be spent to cast artifact spells or to activate abilities of artifacts
4. Repeat

Results

• Infinite colorless mana that can only be spent to activate abilities of artifacts
• Infinite colorless mana that can only be spent to cast artifact spells
• Infinite death triggers
• Infinite ETB
• Infinite lifegain
• Infinite lifegain triggers
• Infinite LTB
• Infinite sacrifice triggers