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

Infinite colorless mana

Infinite death triggers

Infinite ETB

Infinite lifegain triggers

Infinite LTB

Infinite sacrifice triggers

Infinite storm count

Fool's Demise

Channel

Phyrexian Altar

Linvala, the Preserver

Combos with "Linvala, the Preserver"