Actually, the weilding jar ability does not trigger due to you sacrificing the retriever to the Atog. You CANNOT regenerate sacrificed creatures (see rulebook). Thus this cannot happen, sorry. Well technically you can still sac the weilding jar to the retriever, but it just won't do anything. btw, regeneration is a replacement effect, thus the retriever, if regenerated, does not hit graveyard from play.
Kirby, you can use retriever instead of junkdiver (costs 1 less and uncommon). The combo I'm not sure I understood tho. lol
Anyway, killing spree:
Door to Nothingness, Doubling Cube, Twiddle, 11 mana = target opponent loses.
So have 11 mana, activate doubling cube to get 16 mana. Pay 5 (of any mana) for Door to Nothingness. Cast twiddle (1 blue) to untap it. Tap 10 (2 of each colour), sac Door to nothingness: target player loses the game. Simple 11 mana with 6 mana specifications. Should have no problem with channel the suns + 1 blue mana anyway. Anyone up for UG with this? btw, if you do use channel the suns, you need 10 mana, with mana specifications of 1 green mana and 1 blue mana (easier).