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

Infinite creature ETB

Infinite creature LTB

Infinite blinking

Infinite blinking of most creatures

Infinite colorless mana

Infinite creature tokens

Infinite death triggers

Infinite creature sacrifice triggers

Eldrazi Displacer

Ashnod's Altar

Birthing Hulk

Activate Eldrazi Displacer's ability by paying {C}, blinking Birthing Hulk.
Birthing Hulk enters the battlefield tapped, triggering itself, creating two 1/1 Eldrazi Scion tokens.
Activate an Eldrazi Scion by sacrificing it, adding {C}.
Repeat.
Once you have infinite Eldrazi Scion tokens, you may activate any number of them.

Training Grounds

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

Nim Deathmantle

Activate Eldrazi Displacer by paying {C}, blinking Birthing Hulk.
Birthing Hulk enters the battlefield, creating two 1/1 Eldrazi Scion creature tokens.
Activate an Eldrazi Scion by sacrificing it, adding {C}.
Repeat.

Zirda, the Dawnwaker

Activate Eldrazi Displacer by paying {C}, blinking Birthing Hulk.
Birthing Hulk enters the battlefield, creating two 1/1 colorless Eldrazi Scion tokens.
Activate Eldrazi Scion by sacrificing it, adding {C}.
Repeat.

Biomancer's Familiar

Activate Phyrexian Altar by sacrificing Birthing Hulk, adding {W}.
When Birthing Hulk dies, Mazzy's second ability and Gift of Immortality trigger.
Resolve the Mazzy trigger, exiling Gift of Immortality with the ability to cast it until end of your next turn.
Resolve the Gift of Immortality trigger, returning Birthing Hulk from your graveyard to the battlefield.
When Birthing Hulk enters, it triggers, creating two creature tokens.
Activate two creature tokens by sacrificing them, adding {C}{C}.
Cast Gift of Immortality from exile by paying {2}{W}, attaching it to Birthing Hulk.
Repeat.

Combos with "Birthing Hulk"