Intruder Alarm's first ability prevents creatures from untapping during their controller's untap step.
Because Hushbringer prevents abilities from triggering whenever a creature enters the battlefield, Intruder Alarm's second ability does not trigger to untap them.

Creatures do not untap during their controller's untap step

Intruder Alarm

Hushbringer

Attack with Brago, dealing combat damage.
Brago triggers, exiling and returning Wormfang Manta to the battlefield.
Wormfang Manta triggers, gaining an additional turn after this one.
Repeat.

Infinite turns

Brago, King Eternal

Wormfang Manta

At the beginning of your end step Conjurer's Closet triggers, exiling Wormfang Manta and returns it to the battlefield.
On LTB Wormfang Manta triggers, giving you an extra turn.
On ETB Hushbringer prevents Wormfang Manta's trigger, so you do not skip your next turn.
Take your extra turn.

Conjurer's Closet

Activate Mistmeadow Witch targeting Wormfang Manta.
On LTB Wormfang Manta triggers, giving you an extra turn.
On ETB Hushbringer prevents Wormfang Manta's trigger, so you do not skip your next turn.
Take your extra turn.

Mistmeadow Witch

Declare any creature as an attacker, attacking an opponent unable to block it.
When the creature is unblocked, activate Phage's ninjutsu ability by paying {2}{U}{B} and returning the unblocked creature to your hand, putting Phage onto the battlefield tapped and attacking.
Phage enters the battlefield, however its ability does not trigger due to Hushbringer.
Deal combat damage with Phage.
Phage triggers, causing the opponent to lose the game.

Target opponent loses the game

Satoru Umezawa

Phage the Untouchable

Activate Roon of the Hidden Realm by paying {2} and tapping it, exiling Wormfang Manta until your end step.
When Wormfang Manta leaves the battlefield, its second ability triggers, causing you to take an extra turn after this one.
At the beginning of your end step, Roon of the Hidden Realm triggers, returning Wormfang Manta to the battlefield from exile.
Wormfang Manta's first ability does not trigger due to Hushbringer.
Repeat each turn.

Roon of the Hidden Realm

At the beginning of your end step Thassa triggers, exiling Wormfang Manta and returns it to the battlefield.
Wormfang Manta leaves the battlefield, giving you an extra turn.
On ETB Hushbringer prevents Wormfang Manta's trigger, so you do not skip your next turn.
Take your extra turn.

Thassa, Deep-Dwelling

Activate Nephalia Smuggler targeting Wormfang Manta.
On LTB Wormfang Manta triggers, giving you an extra turn.
On ETB Hushbringer prevents Wormfang Manta's trigger, so you do not skip your next turn.
Take your extra turn.

Nephalia Smuggler

At the beginning of your end step, Teleportation Circle triggers, blinking Wormfang Manta.
Wormfang Manta's first ability does not trigger due to Hushbringer.
Wormfang Manta's second ability triggers, causing you to take an extra turn after this one.
Repeat each turn.

Teleportation Circle

Activate Venser's +2 loyalty ability exiling Wormfang Manta.
Wormfang Manta's LTB triggers, granting you an extra turn after this one.
At the beginning of your end step, Wormfang Manta returns to the battlefield.
Repeat for infinite turns.

Venser, the Sojourner

Cast Mercurial Pretender for {4}{U}, entering as a copy of Wormfang Manta.
Pay {2}{U}{U} to return it to your hand, triggering Wormfang Manta's LTB, granting you an extra turn after this one.
Repeat for infinite turns.

Mercurial Pretender

Activate Erratic Portal by paying {1} and tapping it, returning Wormfang Manta from the battlefield to your hand.
Wormfang Manta leaves the battlefield, triggering its first ability, causing you to take an extra turn after this one.
Cast Wormfang Manta by paying {5}{U}{U}.
Wormfang Manta enters the battlefield, but its first ability does not trigger due to Hushbringer.
Repeat each turn.

Erratic Portal

At tbe beginning of your combat phase, Mirage Phalanx and Wormfang Manta trigger.
Resolve the Mirage Phalanx trigger, creating a token copy of it with haste and that doesn't have soulbond.
Resolve the Wormfang Manta trigger, creating a token copy of it with haste.
The Wormfang Manta token's first ability does not trigger due to Hushbringer.
At the end of your combat phase, the Mirage Phalanx and Wormfang Manta tokens trigger, exiling themselves.
The Wormfang Manta token's second ability triggers, causing you to take an extra turn after this one.
Repeat each turn.

Mirage Phalanx

Activate Ashnod's Altar by sacrificing Wormfang Manta, adding {C}{C}.
Wormfang Manta dies, triggering its second ability, causing you to take an extra turn after this one.
Activate Conduit of Worlds by tapping it, allowing you to cast Wormfang Manta from your graveyard this turn.
Cast Wormfang Manta by paying {5}{U}{U}.
Wormfang Manta enters the batltefield, but its first ability does not trigger due to Hushbringer.
Repeat each turn.

You cannot cast spells

Conduit of Worlds

Ashnod's Altar

Declare Sophina and two other nontoken creatures as attackers.
Sophina triggers, creating three Clue artifact tokens.
Activate Ashnod's Altar by sacrificing Wormfang Manta, adding {C}{C}.
Wormfang Manta leaves the battlefield, causing you to take an extra turn after this one.
If Wormfang Manta was put onto the battlefield by Havengul Mystery, Havengul Mystery triggers, transforming itself.
Activate the Clue tokens by paying {6}, tapping and sacrificing them, causing you to draw three cards.
At the beginning of your end step, Havengul Laboratory triggers, transforming itself.
Havengul Mystery triggers, returning Wormfang Manta from your graveyard to the battlefield.
Repeat each turn.

Sophina, Spearsage Deserter

Havengul Laboratory // Havengul Mystery

Cast Sakashima for {2}{U}{U}, entering as a copy of Wormfang Manta.
Pay {2}{U}{U} to return it to your hand, triggering Wormfang Manta's LTB, granting you an extra turn after this one.
Repeat for infinite turns.

Sakashima the Impostor

Attack with Ilharg.
Ilharg's attack trigger triggers, putting Wormfang Manta onto the battlefield tapped and attacking.
At the beginning of your end step, Wormfang Manta is returned to your hand.
This triggers its LTB, granting you an extra turn after this one.
Repeat for infinite turns.

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