Cast Haze of Rage with buyback by paying {3}{R}.
Displacer Kitten, Vivi and Haze of Rage's storm ability trigger.
Resolve the Vivi trigger, putting a +1/+1 counter on it and dealing 1 damage to each opponent.
Holding priority, activate Vivi by paying {0}, adding at least {3}{R}.
Resolve the Displacer Kitten trigger, blinking Vivi.
When Vivi enters the battlefield, Hero's Blade triggers, attaching Hero's Blade to Vivi.
Resolve the Haze of Rage trigger, copying it for each spell cast before it this turn.
Resolve all Haze of Rages, returning the original Haze of Rage to your hand.
Repeat.

Infinite creature LTB

Infinite creature ETB

Infinite damage

Infinite storm count

Infinite magecraft triggers

Infinitely powerful creatures you control until end of turn

Vivi Ornitier

Hero's Blade

Displacer Kitten

Haze of Rage

Activate Goblin Bombardment by sacrificing Rograkh.
Rograkh dies, triggering Koll, returning Rograkh from your graveyard to your hand.
Resolve the Goblin Bombardment ability, dealing 1 damage to any target.
Cast Rograkh by paying {0}.
Rograkh enters the battlefield, triggering Hero's Blade, attaching Hero's Blade to Rograkh.
Repeat.

Infinite death triggers

Infinite creature sacrifice triggers

Koll, the Forgemaster

Rograkh, Son of Rohgahh

Goblin Bombardment

Activate Ashnod's Altar by sacrificing Rograkh, adding {C}{C}.
Rograkh dies, triggering Koll, returning Rograkh from your graveyard to your hand.
Cast Rograkh by paying {0}.
Rograkh enters the battlefield, triggering Hero's Blade, attaching Hero's Blade to Rograkh.
Repeat.

Infinite colorless mana

Ashnod's Altar

Activate Ashnod's Altar by sacrificing Hope of Ghirapur, adding {C}{C}.
Hope of Ghirapur dies, triggering Koll, returning Hope of Ghirapur from your graveyard to your hand.
Cast Hope of Ghirapur by paying {1}.
Hope of Ghirapur enters the battlefield, triggering Hero's Blade, attaching Hero's Blade to Hope of Ghirapur.
Repeat.

Hope of Ghirapur

Activate Ashnod's Altar by sacrificing Zabaz, adding {C}{C}.
Zabaz dies, triggering its modular ability and Koll.
Resolve the Zabaz trigger, putting a +1/+1 counter on any artifact creature you control.
Resolve the Koll trigger, returning Zabaz from your graveyard to your hand.
Cast Zabaz by paying {1}.
Zabaz enters the battlefield, triggering Hero's Blade, attaching Hero's Blade to Zabaz.
Repeat.

Infinite +1/+1 counters on certain creatures

Zabaz, the Glimmerwasp

Activate Krark-Clan Ironworks by sacrificing Hope of Ghirapur, adding {C}{C}.
Hope of Ghirapur dies, triggering Koll, returning Hope of Ghirapur from your graveyard to your hand.
Cast Hope of Ghirapur by paying {1}.
Hope of Ghirapur enters the battlefield, triggering Hero's Blade, attaching Hero's Blade to Hope of Ghirapur.
Repeat.

Krark-Clan Ironworks

Activate Krark-Clan Ironworks by sacrificing Zabaz, adding {C}{C}.
Zabaz dies, triggering its modular ability and Koll.
Resolve the Zabaz trigger, putting a +1/+1 counter on any artifact creature you control.
Resolve the Koll trigger, returning Zabaz from your graveyard to your hand.
Cast Zabaz by paying {1}.
Zabaz enters the battlefield, triggering Hero's Blade, attaching Hero's Blade to Zabaz.
Repeat.

Combos with "Hero's Blade"