Ghave, Guru of Combo (EDH / Commander)

There are four pieces to the combo with multiple cards in each slot.

Mana generating sac outlet:
Phyrexian Altar
Ashnod's Altar

+1/+1 counter generator:
Doubling Season
Juniper Order Ranger
Lumberknot
Ninth Bridge Patrol
Rot Shambler
Twilight Drover
Unruly Mob

Drain effect:
Blood Artist
Poison-Tip Archer
Zulaport Cutthroat

And Ghave, Guru of Spores

Now with one of each of the pieces on the battlefield you create a saproling with Ghave then you sac the saproling to Ashnod's altar gaining two mana then the rot shambler and blood artist trigger draining an opponent for one gaining you one life then you put a +1/+1 counter on the rot shambler. Using one of the two mana you recieved from Ashnod's Altar you remove the +1/+1 counter from Rot Shambler to make a saproling and do it again looping infinitely creating infinite colorless mana draining your opponents for all their life and gaining infinite life thus winning the game.

The rest of the deck is removal to get rid of big threats, green hexproof spells to protect your combo pieces and some graveyard recursion to get back lost altars

Deck plays itself for the most part

also there's another combo with
Ghave + Altar + Geralf's Messenger = win
if you have an Altar and a tutor in hand just go for this