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

Infinite death triggers

Infinite ETB

Infinite lifegain triggers

Infinite LTB

Infinite sacrifice triggers

Infinite storm count

Fool's Demise

Channel

Phyrexian Altar

Lone Missionary

Combos with "Lone Missionary"