Activate Tariel by tapping it, putting a creature card from an opponent's graveyard onto the battlefield under your control.
The creature enters the battlefield, triggering Intruder Alarm, untapping all creatures.
Repeat.

Put all creatures from each opponent's graveyard onto the battlefield under your control

Tariel, Reckoner of Souls

Intruder Alarm

Activate Tariel to return a random creature from target opponent's graveyard to the battlefield.
Sacrifice the returned creature to Phyrexian Altar, triggering Thornbite Staff and untapping Tariel.
Repeat steps 1-2.

Infinite colored mana

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite sacrifice triggers

Phyrexian Altar

Thornbite Staff

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