Khalni Gem Combos
Myr Welder + Freed from the Real + Khalni Gem
Myr Welder + Pemmin's Aura + Khalni Gem
Myr Welder + Staff of Domination + Khalni Gem
Trazyn the Infinite + Staff of Domination + Khalni Gem
Combo result
Infinite colored 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.