Activate Goblin Goliath by paying {3}{R} and tapping it, causing you to deal double the damage to opponent this turn.
Activate Heartless Hidetsugu by tapping it, causing it to deal damage to each opponent equal to the opponent's life total, and to you equal to half your life total, rounded down.
Each opponent loses the game due to having zero or less life.

Each opponent loses the game

Near-infinite damage

Heartless Hidetsugu

Goblin Goliath

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

Infinite creature ETB

Infinite creature LTB

Infinite colorless mana

Infinite creature tokens

Infinite death triggers

Infinite creature sacrifice triggers

Nim Deathmantle

Ashnod's Altar

Activate Eldrazi Displacer by paying {2}{C}, blinking Goblin Goliath.
When Goblin Goliath enters, it triggers, creating at least 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 Goblin Goliath by paying {1}{U}, blinking itself.
Goblin Goliath enters the battlefield, triggering itself and Deadeye Navigator's soulbond ability.
Resolve the Deadeye Navigator trigger, repairing it and Goblin Goliath.
Resolve the Goblin Goliath trigger, creating at least three 1/1 Goblin creature tokens.
Activate Phyrexian Altar by sacrificing two Goblin tokens, adding {1}{U}.
Repeat.

Infinite colored mana

Deadeye Navigator

Phyrexian Altar

Activate Emiel by paying {3}, blinking Goblin Goliath.
Goblin Goliath enters the battlefield, creating at least two 1/1 Goblin creature tokens.
Activate Ashnod's Altar by sacrificing two Goblin tokens, adding {C}{C}{C}{C}.
Repeat.

Emiel the Blessed

Activate Emiel by paying {3}, blinking Goblin Goliath.
Goblin Goliath enters the battlefield, creating at least three 1/1 Goblin creature tokens.
Activate Phyrexian Altar by sacrificing the three Goblin tokens, adding {3}.
Repeat.

Combos with "Goblin Goliath"