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

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Infinite colorless mana

Infinite creature tokens

Infinite death triggers

Nim Deathmantle

Ashnod's Altar

Grave Titan

Activate Chainer by paying {B}{B}{B} and 3 life, returning Grave Titan from your graveyard to the battlefield.
When Grave Titan enters, it triggers, creating two 2/2 Zombie creature tokens.
Activate Phyrexian Altar three times by sacrificing Grave Titan and the two Zombies, adding {B}{B}{B}
When Grave Titan and the Zombie tokens die, Blood Artist triggers three times, causing you to gain 1 life and target opponent to lose 1 life for each trigger.
Repeat.

Infinite lifeloss

Chainer, Dementia Master

Phyrexian Altar

Blood Artist

Activate Eldrazi Displacer by paying {2}{C}, blinking Grave Titan.
When Grave Titan 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

Declare the creature with Breath of Fury attached and Grave Titan as attackers.
Grave Titan triggers, creating a creature token.
Deal combat damage using the creature that has Breath of Fury attached. 
Breath of Fury triggers, causing you to sacrifice the creature it is attached to, then attach Breath of Fury to the creature token, then causing you to untap all creatures you control and to get an additional combat phase after this one.
Repeat each combat phase.

Infinite combat damage

Infinite combat phases

Infinite mana creatures you control can produce

Infinite untap of creatures you control

Infinite creature tokens with haste

Breath of Fury

Anger

Declare The Incredible Hulk and Grave Titan as attackers.
Grave Titan triggers, creating two creature tokens.
Holding priority, activate Goblin Bombardment by sacrificing a creature token, dealing 1 damage to The Incredible Hulk.
The Incredible Hulk triggers, putting a +1/+1 counter on it, then untapping it and causing you to get an additional combat phase after this one.
Repeat each combat phase.

Infinite damage

Bruce Banner // The Incredible Hulk

Goblin Bombardment

Combos with "Grave Titan"