Activate Ravenous Baloth by sacrificing another Beast, causing you to gain 4 life.
Trudge Garden triggers, causing you to pay 2 to create two 4/4 Fungus Beast creature tokens.
Activate Ashnod's Altar by sacrificing a Fungus Beast, adding CC.
Repeat.
This vicious ecosystem turns the sheer bulk of Ravenous Baloth into a self-sustaining engine of life and limbs. By sacrificing a Beast to the Baloth, you harvest 4 life to feed Trudge Garden's trigger; paying the required {2}—conveniently fueled by sacrificing one of the resulting tokens to Ashnod's Altar—creates a Fungus Beast. Doubling Season ensures that your investment yields two tokens instead of one, leaving you with a permanent surplus to sacrifice back to the Altar for more mana and to the Baloth for more life.