Floodgate Combos
Myr Welder + Staff of Domination + Lavabrink Floodgates
Trazyn the Infinite + Staff of Domination + Lavabrink Floodgates
Combo result
Infinite red mana. Infinite lifegain. Infinite lifegain triggers. Infinite card draw. Infinite draw triggers. Infinite untap of creatures you control.
Prerequisites
Trazyn the Infinite on the battlefield. All other cards in your graveyard. Trazyn the Infinite does not have summoning sickness.