Myr Welder + Staff of Domination + Metalworker

Myr Welder
Staff of Domination
Metalworker

Requires
Myr Welder on the battlefield. All other permanents in graveyard. Myr Welder does not have summoning sickness. You have at least one artifact card in hand. 2 available.
Steps
  1. Activate Myr Welder by tapping it, exiling Staff of Domination from your graveyard
  2. Activate Myr Welder using Staff of Domination's first ability by paying 1, untapping Myr Welder
  3. Activate Myr Welder by tapping it, exiling Metalworker from your graveyard
  4. Activate Myr Welder using Staff of Domination's first ability by paying 1, untapping Myr Welder
  5. Activate Myr Welder using Metalworker's ability by tapping it, revealing artifact cards from your hand, adding cc for each artifact cards revealed
  6. Repeat from step 4
Results
Infinite colorless mana. Infinite card draw. Infinite lifegain. Infinite lifegain triggers.