Cast Phyrexian Metamorph by paying its mana cost. Choose to have it enter as a copy of Princess Yue.
Put Phyrexian Metamorph into your graveyard due to the legend rule.
When Phyrexian Metamorph dies, it triggers, returning it from your graveyard to the battlefield as a land named Moon. Choose to have it enter as a copy of Wormfang Newt, gaining its abilities.
When Phyrexian Metamorph enters, its first ability triggers, exiling it.
When Phyrexian Metamorph leaves the battlefield, its second ability triggers, returning Phyrexian Metamorph from exile to the battlefield. Choose to have it enter as a copy of Princess Yue.
Repeat from step 2.

Infinite creature LTB

Infinite creature ETB

Infinite death triggers

Infinite landfall triggers

Princess Yue

Wormfang Newt

Phyrexian Metamorph

Activate Sol Ring and a land by tapping them, adding at least {C}{C}{U}.
Cast Wormfang Newt by paying {1}{U}.
Hullbreaker Horror triggers, returning Sol Ring from the battlefield to your hand.
When Wormfang Newt enters, its first ability triggers, exiling the land tapped in step 1
Cast Sol Ring by paying {1}.
Hullbreaker Horror triggers, returning Wormfang Newt from the battlefield to your hand.
Wormfang Newt's second ability triggers, returning the Iand from exile to the battlefield.
Repeat.

Infinite artifact ETB

Infinite artifact LTB

Infinite storm count

Hullbreaker Horror

Sol Ring

Cast Wormfang Newt by paying {1}{U}.
When Wormfang Newt enters the battlefield, its first ability triggers, exiling Wormfang Newt.
When Wormfang Newt leaves the battlefield, its second ability triggers, returning itself from exile to the battlefield.
Repeat from step 2.

Ashaya, Soul of the Wild

Activate Goblin Bombardment by sacrificing Wormfang Newt.
When Wormfang Newt dies, its second ability triggers, returning a Plains from exile to the battlefield.
When the Plains enters the battlefield, Emeria Shepherd triggers.
Holding priority, activate the Plains by tapping it, adding {W}.
Resolve the Emeria Shepherd trigger, returning Wormfang Newt from your graveyard to the battlefield.
When Wormfang Newt enters the battlefield, its first ability triggers, exiling a Plains.
Resolve the Goblin Bombardment ability from step 1, dealing 1 damage to any target.
Repeat.

Combos with "Wormfang Newt"