Trazyn the Infinite + Staff of Domination + Grim Monolith

Trazyn the Infinite
Staff of Domination
Grim Monolith

Requires
Trazyn the Infinite on the battlefield. All other permanents in graveyard. Trazyn the Infinite does not have summoning sickness.
Steps
  1. Activate Trazyn the Infinite using Grim Monolith's first activated ability by tapping it, adding ccc
  2. Activate Trazyn the Infinite using Staff of Domination's first ability by paying 1, untapping Trazyn the Infinite
  3. Repeat
  4. Once you have infinite mana, you may activate any of Staff of Domination's abilities any number of times
Results
Infinite colorless mana. Infinite card draw. Infinite lifegain. Infinite lifegain triggers. Infinite untap of creatures.