Firja, Judge of Death (Commander / EDH Deck Tech) 

I might have not been as clear as I wanted. Say you've got Karmic Guide in hand and Sun Titan and Animate Dead in the graveyard. You cast Guide targeting Sun Titan, then sacrifice the Karmic Guide with the trigger on the stack. Let the Guide Trigger resolve and bring Sun Titan out targeting the Animate Dead. Sacrifice the Sun Titan. Let the Titan trigger resolve bringing the Animate Dead into play. Target Karmic Guide with the animate dead once it enters, let that resolve and bring Karmic guide out. Target the Sun Titan with Karmic guide, then sacrifice karmic guide with the trigger on the stack, now all 3 cards are back in the graveyard before Sun Titan comes out. This is why we need to do it with three cards, so only two are ever on the field at the same time and the next card in the combo is back in the graveyard.