Cast Channel by paying {G}{G}.
Activate Phyrexian Altar by sacrificing Webweaver Changeling, adding {U}.
When Webweaver Changeling dies, Fool's Demise's first and second abilities trigger.
Resolve the first Fool's Demise trigger, returning Webweaver Changeling from your graveyard to the battlefield.
When Webweaver Changeling enters the battlefield, it triggers, causing you to gain 5 life.
Resolve the second Fool's Demise trigger, returning it from your graveyard to your hand.
Activate Channel four times by paying 4 life, adding {C}{C}{C}{C}.
Cast Fool's Demise by paying {4}{U}, attaching it to Webweaver Changeling.
Repeat from step 2.

Infinite colorless mana

Infinite death triggers

Infinite ETB

Infinite lifegain

Infinite lifegain triggers

Infinite LTB

Infinite sacrifice triggers

Infinite storm count

Fool's Demise

Channel

Phyrexian Altar

Webweaver Changeling

Combos with "Webweaver Changeling"