Cast Devoted Grafkeeper from your graveyard for its disturb cost by paying {W}{U}, causing it to enter the battlefield as Departed Soulkeeper.
Oketra's Monument triggers, creating a 1/1 Warrior creature token.
Activate Phyrexian Altar twice by sacrificing the Warrior and Departed Soulkeeper, adding {W}{U}.
Departed Soulkeeper is not exiled due to Humility removing its ability.
Repeat.

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Infinite storm count

Phyrexian Altar

Devoted Grafkeeper // Departed Soulkeeper

Oketra's Monument

Humility

Cast Devoted Grafkeeper from your graveyard for its disturb cost by paying {W}{U}, causing it to enter the battlefield as Departed Soulkeeper.
Oketra's Monument triggers, creating a 1/1 Warrior creature token.
Activate Phyrexian Altar twice by sacrificing the Warrior and Departed Soulkeeper, adding {W}{U}.
Departed Soulkeeper is not exiled due to Overwhelming Splendor removing its ability.
Repeat.

Overwhelming Splendor

Cast Devoted Grafkeeper from your graveyard for its disturb cost by paying {W}{U}, causing it to enter the battlefield as Departed Soulkeeper.
Oketra's Monument triggers, creating a 1/1 Warrior creature token.
Activate Phyrexian Altar twice by sacrificing the Warrior and Departed Soulkeeper, adding {W}{U}.
Departed Soulkeeper is not exiled due to Dress Down removing its ability.
Repeat.

Dress Down

Cast Departed Soulkeeper from your graveyard by paying it's disturb cost of {1}{W}{U}.
Departed Soulkeeper enters the battlefield as a copy of Composite Golem.
Activate Departed Soulkeeper by sacrificing it, adding {W}{U}{B}{R}{G}.
Repeat.

Combos with "Devoted Grafkeeper // Departed Soulkeeper"