Thopter Foundry + Sword of the Meek + Grand Architect + Heartless Summoning
Thopter Foundry
Sword of the Meek
Grand Architect
Heartless Summoning
Requires
Thopter Foundry must be on the battlefield.
Sword of the Meek must be on the battlefield.
Grand Architect must be on the battlefield.
Heartless Summoning must be on the battlefield.
Mana needed: 
Steps
- 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.
- When the Thopter enters the battlefield, Sword of the Meek triggers, returning it from your graveyard to the battlefield attached to the Thopter.
- 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. - 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.
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