Cast Channel by paying {G}{G}.
Activate Phyrexian Altar by sacrificing Skystreamer, adding {U}.
When Skystreamer dies, Fool's Demise's first and second abilities trigger.
Resolve the first Fool's Demise trigger, returning Skystreamer from your graveyard to the battlefield.
When Skystreamer 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 Skystreamer.
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

Skystreamer

Combos with "Skystreamer"