Cast Herbal Poultice by paying {0}.
Herbal Poultice enters the battlefield as a copy of Cavalier of Dawn.
Copy of Cavalier of Dawn enter-the-battlefield ability triggers, destroying itself and creating you a 3/3 Golem token.
Copy of Cavalier of Dawn dies, triggering itself, returning Herbal Poultice from your graveyard to your hand.
Repeat.

Infinite creature tokens

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite storm count

Cavalier of Dawn

Infinite Reflection

March of the Machines

Herbal Poultice

Tap Barrage Ogre, sacrificing Herbal Poultice to deal 2 damage to any target.
Tap Emry, targeting Herbal Poultice.
Cast Herbal Poultice.
Jeskai Ascendancy triggers, allowing you to loot.
Jeskai Ascendancy triggers, untapping all creatures you control and giving them +1/+1 until end of turn.
Repeat.

Infinite mana creatures you control can produce

Infinite damage

Infinite looting

Infinite untap of creatures you control

Infinitely large creatures you control until end of turn

Emry, Lurker of the Loch

Jeskai Ascendancy

Barrage Ogre

Tap Orcish Vandal, sacrificing Herbal Poultice to deal 2 damage to any target.
Tap Emry, targeting Herbal Poultice.
Cast Herbal Poultice.
Jeskai Ascendancy triggers, allowing you to loot.
Jeskai Ascendancy triggers, untapping all creatures you control and giving them +1/+1 until end of turn.
Repeat.

Orcish Vandal

Tap Orcish Mechanics, sacrificing Herbal Poultice to deal 2 damage to any target.
Tap Emry, targeting Herbal Poultice.
Cast Herbal Poultice.
Jeskai Ascendancy triggers, allowing you to loot.
Jeskai Ascendancy triggers, untapping all creatures you control and giving them +1/+1 until end of turn.
Repeat.

Orcish Mechanics

Tap Embraal Gear-Smasher, sacrificing Herbal Poultice to deal 2 damage to each opponent.
Tap Emry, targeting Herbal Poultice.
Cast Herbal Poultice.
Jeskai Ascendancy triggers, allowing you to loot.
Jeskai Ascendancy triggers, untapping all creatures you control and giving them +1/+1 until end of turn.
Repeat.

Embraal Gear-Smasher

Combos with "Herbal Poultice"