The downside is the enchantment has to survive until your upkeep and it only triggers if one opponent has three or more creatures
Temmet, Naktamun's Will gives +1/+1 whenever a card is drawn, Cemetery Reaper gives a static +1/+1 boost to all Zombies, and On Wings of Gold gives a +1/+1 stat boost and makes a 1/1 Zombie whenever a card leaves your graveyard
For each of them, put a number of +1/+1 counters on it equal to the number of colors it is
Borborygmos Enraged Borborygmos Enraged turns spare lands into Lightning Bolts for a terrifying threat
Giant Adephage might seem like it should stay based on the size, but it really just ends up being a plain vanilla 7/7 creature if you aren't doing any token doubling
However, it is certainly worthwhile in Commander, since there are some commanders who are great at producing energy and you can also do some fun political stuff with it