Cast Apprentice Necromancer by paying {1}{B}.
Apprentice Necromancer enters the battlefield, triggering Mana Echoes and Inalla.
Resolve the Mana Echoes trigger, adding at least {C}{C}.
Resolve the Inalla trigger, causing you to pay {1} to create a token copy of Apprentice Necromancer with haste.
The token Apprentice Necromancer enters the battlefield, triggering Mana Echoes, adding at least {C}{C}{C}.
Activate Phyrexian Altar by sacrificing the nontoken Apprentice Necromancer, adding {B}.
Activate the token Apprentice Necromancer by paying {B}, tapping and sacrificing it, returning the nontoken Apprentice Necromancer from your graveyard to the battlefield with haste.
Repeat from step 2.

Infinite colorless mana

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Inalla, Archmage Ritualist

Apprentice Necromancer

Mana Echoes

Phyrexian Altar

Activate Ruthless Knave's first ability by paying {2}{B} and sacrificing it.
Ashnod the Uncaring triggers, copying Ruthless Knave's ability.
Resolve both Ruthless Knave abilities, creating four Treasure artifact tokens.
Activate the four Treasures by tapping and sacrificing them, adding {2}{B}{B}.
Activate Apprentice Necromancer by paying {B}, tapping and sacrificing it, targeting Ruthless Knave.
Ashnod the Uncaring triggers, copying Apprentice Necromancer's ability, targeting Apprentice Necromancer.
Resolve both Apprentice Necromancer abilities, returning Apprentice Necromancer and Ruthless Knave from your graveyard to the battlefield, and giving them haste until end of turn.
Repeat.

Ashnod the Uncaring

Ruthless Knave

Activate Phyrexian Altar by sacrificing another nontoken creature, adding {B}.
Activate Apprentice Necromancer by paying {B}, tapping and sacrificing it, targeting any creature card in your graveyard.
Ashnod triggers, copying Apprentice Necromancer's ability, targeting Apprentice Necromancer.
Resolve both Apprentice Necromancer abilities, returning Apprentice Necromancer and another creature from your graveyard to the battlefield, and giving them haste until end of turn.
Repeat.

Activate Blood Pet by sacrificing it, adding {B}.
Activate Apprentice Necromancer by paying {B}, tapping and sacrificing it, targeting Blood Pet.
Ashnod triggers, copying Apprentice Necromancer's ability, targeting Apprentice Necromancer.
Resolve both Apprentice Necromancer abilities, returning Apprentice Necromancer and Blood Pet from your graveyard to the battlefield, and giving them haste until end of turn.
Repeat.

Blood Pet

Activate Basal Thrull by tapping and sacrificing it, adding {B}{B}.
Activate Apprentice Necromancer by paying {B}, tapping and sacrificing it, targeting Basal Thrull.
Ashnod triggers, copying Apprentice Necromancer's ability, targeting Apprentice Necromancer.
Resolve both Apprentice Necromancer abilities, returning Apprentice Necromancer and Basal Thrull from your graveyard to the battlefield, and giving them haste until end of turn.
Repeat.

Infinite black mana

Basal Thrull

Activate Basal Sliver by sacrificing it, adding {B}{B}.
Activate Apprentice Necromancer by paying {B}, tapping and sacrificing it, targeting Basal Sliver.
Ashnod triggers, copying Apprentice Necromancer's ability, targeting Apprentice Necromancer.
Resolve both Apprentice Necromancer abilities, returning Apprentice Necromancer and Basal Sliver from your graveyard to the battlefield, and giving them haste until end of turn.
Repeat.

Basal Sliver

Activate Ornithopter of Paradise by tapping it, adding {B}.
Activate Teardrop Kami by sacrificing it, targeting Ornithopter of Paradise.
Ashnod triggers, copying Teardrop Kami's ability, targeting Ornithopter of Paradise.
Resolve the first Teardrop Kami trigger, untapping Ornithopter of Paradise.
Activate Ornithopter of Paradise by tapping it, adding {B}.
Resolve the second Teardrop Kami trigger, untapping Ornithopter of Paradise.
Activate Apprentice Necromancer by paying {B}, tapping and sacrificing it, targeting Teardrop Kami.
Ashnod triggers, copying Apprentice Necromancer's ability, targeting Apprentice Necromancer.
Resolve both Apprentice Necromancer abilities, returning Apprentice Necromancer and Teardrop Kami from your graveyard to the battlefield, and giving them haste until end of turn.
Repeat.

Infinite mana creatures you control can produce

Infinite untap of creatures you control

Teardrop Kami

Ornithopter of Paradise

Activate Alloy Myr by tapping it, adding {B}.
Activate Teardrop Kami by sacrificing it, targeting Alloy Myr.
Ashnod triggers, copying Teardrop Kami's ability, targeting Alloy Myr.
Resolve the first Teardrop Kami trigger, untapping Alloy Myr.
Activate Alloy Myr by tapping it, adding {B}.
Resolve the second Teardrop Kami trigger, untapping Alloy Myr.
Activate Apprentice Necromancer by paying {B}, tapping and sacrificing it, targeting Teardrop Kami.
Ashnod triggers, copying Apprentice Necromancer's ability, targeting Apprentice Necromancer.
Resolve both Apprentice Necromancer abilities, returning Apprentice Necromancer and Teardrop Kami from your graveyard to the battlefield, and giving them haste until end of turn.
Repeat.

Alloy Myr

Activate Leaden Myr by tapping it, adding {B}.
Activate Teardrop Kami by sacrificing it, targeting Leaden Myr.
Ashnod triggers, copying Teardrop Kami's ability, targeting Leaden Myr.
Resolve the first Teardrop Kami trigger, untapping Leaden Myr.
Activate Leaden Myr by tapping it, adding {B}.
Resolve the second Teardrop Kami trigger, untapping Leaden Myr.
Activate Apprentice Necromancer by paying {B}, tapping and sacrificing it, targeting Teardrop Kami.
Ashnod triggers, copying Apprentice Necromancer's ability, targeting Apprentice Necromancer.
Resolve both Apprentice Necromancer abilities, returning Apprentice Necromancer and Teardrop Kami from your graveyard to the battlefield, and giving them haste until end of turn.
Repeat.

Combos with "Apprentice Necromancer"