Activate Phyrexian Altar by sacrificing Orah, adding {B}.
Orah dies, returning Doomed Necromancer to the battlefield.
Activate Lightning Greaves' equip ability by paying {0}, attaching it to Dopomed Necromancer.
Activate Doomed Necromancer by paying {B} tapping, and sacrificing it, returning Orah to the battlefield.
Repeat.


Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Orah, Skyclave Hierophant

Doomed Necromancer

Lightning Greaves

Phyrexian Altar

Activate Phyrexian Altar by sacrificing Gixian Puppeteer, adding {B}.
When Gixian Puppeteer dies, its second ability triggers, returning Doomed Necromancer from your graveyard to the battlefield.
Activate Lightning Greaves' equip ability by paying {0}, attaching it to Dopomed Necromancer.
Activate Doomed Necromancer by paying {B}, tapping and sacrificing it, returning Gixian Puppeteer from your graveyard to the battlefield.
Repeat.


Gixian Puppeteer

Activate Ashnod's Altar by sacrificing Eternal Witness, adding {C}{C}.
When Eternal Witness dies, Pitiless Plunderer triggers, creating a Treasure artifact token.
Activate the Treasure by tapping and sacrificing it, adding {B}.
Activate Doomed Necromancer by paying {B}, tapping it and sacrificing it.
When Doomed Necromancer dies, Pitiless Plunderer triggers, creating a Treasure artifact token.
Resolve the Doomed Necromancer ability, returning Eternal Witness from your graveyard to the battlefield.
When Eternal Witness enters the battlefield, it triggers, returning Doomed Necromancer from your graveyard to your hand.
Activate a Treasure by tapping and sacrificing it, adding {B}.
Cast Doomed Necromancer by paying {2}{B}.
Repeat.

Infinite storm count

Pitiless Plunderer

Ashnod's Altar

Eternal Witness

Tyvar, Jubilant Brawler

Thousand-Year Elixir

Activate Phyrexian Altar by sacrificing Gixian Puppeteer, adding {B}.
When Gixian Puppeteer dies, its second ability triggers, returning Doomed Necromancer from your graveyard to the battlefield.
Activate Doomed Necromancer by paying {B}, tapping and sacrificing it, returning Gixian Puppeteer from your graveyard to the battlefield.
Repeat.


Anger

Fervor

Urabrask the Hidden

Mass Hysteria

Combos with "Doomed Necromancer"