Activate Pestered Wellguard by tapping it.
Pestered Wellguard triggers, creating a 1/1 Faerie creature token.
When the Faerie enters, Intruder Alarm triggers, untapping all creatures.
Repeat

Infinite creature ETB

Infinite colored mana

Infinite creature tokens

Infinite mana creatures you control can produce

Infinite untap of creatures

Pestered Wellguard

Intruder Alarm

Cryptolith Rite

Activate Pestered Wellguard by tapping it, adding {U}.
Pestered Wellguard triggers, creating a creature token
Activate Freed from the Real by paying {U}, untapping Pestered Wellguard.
Repeat.

Freed from the Real

Paradise Mantle

Declare Pestered Wellguard and the creature with Breath of Fury attached as attackers. Pestered Wellguard triggers, creating a 1/1 Faerie creature token.
Deal combat damage using the creature that has Breath of Fury attached. 
Breath of Fury triggers, causing you to sacrifice the creature it is attached to, then attach Breath of Fury to the Faerie token, then causing you to untap all creatures you control and to get an additional combat phase after this one. 
Repeat each combat phase.

Infinite creature LTB

Infinite combat damage

Infinite combat phases

Infinite death triggers

Infinite creature sacrifice triggers

Infinite untap of creatures you control

Breath of Fury

Thousand-Year Elixir

Activate Pestered Wellguard using the ability granted to it by Thornbite Staff by paying {2} and tapping it.
Pestered Wellguard triggers, creating a creature token.
Resolve the Pestered Wellguard ability from step 1, dealing 1 damage to any target.
Activate Ashnod's Altar by sacrificing the creature token.
When the creature token dies, Pestered Wellguard triggers, untapping Pestered Wellguard.
Repeat.

Infinite damage

Thornbite Staff

Ashnod's Altar

Combos with "Pestered Wellguard"