Belcher FamilyMikaeus, the Unhallowed Buy + Ashnod's Altar Buy + Plague Belcher Buy
This has not yet been posted, so I'm dropping it here. Belcher targets itself with the -1/-1 counters, negating the undying +1/+1 counter. Sac outlet of choice, Altar was just easiest to think of. Inf ETBs and death triggers (and mana, in this case).
Nobody has posted any comments about this Combo, but you can be the first!