Activate Ashnod's Altar by sacrificing Basilica Shepherd, adding {C}{C}.
When Basilica Shepherd dies, Nim Deathmantle triggers, causing you to pay {4} to return Basilica Shepherd from your graveyard to the battlefield and attach Nim Deathmantle to it.
When Basilica Shepherd enters, it triggers, creating two creature tokens.
Activate Ashnod's Altar by sacrificing a creature token, adding {C}{C}.
Repeat.

Infinite colorless mana

Infinite creature tokens

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Nim Deathmantle

Ashnod's Altar

Basilica Shepherd

Activate Eldrazi Displacer by paying {2}{C}, blinking Basilica Shepherd.
When Basilica Shepherd enters, it triggers, creating two creature tokens.
Activate Ashnod's Altar by sacrificing two creature tokens, adding {C}{C}{C}{C}.
Repeat.

Infinite blinking

Infinite blinking of most creatures

Eldrazi Displacer

Activate Emiel by paying {3}, blinking Basilica Shepherd.
Basilica Shepherd enters the battlefield, creating two 1/1 Phyrexian Mite artifact creature tokens.
Emiel triggers twice; choose not to pay both times.
Activate Ashnod's Altar twice by sacrificing two Phyrexian Mites, adding {C}{C}{C}{C}.
Repeat.

Emiel the Blessed

Activate Eldrazi Displacer by paying {2}{C}, blinking Basilica Shepherd.
Basilica Shepherd enters the battlefield, creating two 1/1 Phyrexian Mite artifact creature tokens.
Activate Krark-Clan Ironworks twice by sacrificing two Phyrexian Mites, adding {C}{C}{C}{C}.
Repeat.

Krark-Clan Ironworks

Activate Emiel by paying {3}, blinking Basilica Shepherd.
Basilica Shepherd enters the battlefield, creating two 1/1 Phyrexian Mite artifact creature tokens.
Emiel triggers twice; choose not to pay both times.
Activate Krark-Clan Ironworks twice by sacrificing two Phyrexian Mites, adding {C}{C}{C}{C}.
Repeat.

Activate Basilica Shepherd by paying {1}{U}, blinking it.
Basilica Shepherd enters the battlefield, triggering itself and Deadeye Navigator's soulbond ability.
Resolve the Deadeye Navigator trigger, repairing it and Basilica Shepherd.
Resolve the Basilica Shepherd trigger, creating two 1/1 Phyrexian Mite artifact creature tokens.
Activate Phyrexian Altar twice by sacrificing the Phyrexian Mites, adding {1}{U}.
Repeat.

Combos with "Basilica Shepherd"