At the beginning of your end step, Jon Irenicus triggers, giving control of Phylactery Lich to an opponent who controls no permanents with a phylactery counter on them.
When Phylactery Lich's controller controls no permanents with a phylactery counter on them, Phylactery Lich triggers, causing them to sacrifice it.
However, Phylactery Lich cannot be sacrificed due to its ability.
Phylactery Lich triggers again, creating a mandatory infinite loop that causes the game to end in a draw.

Draw the game

Jon Irenicus, Shattered One

Phylactery Lich

If needed, give control of Phylactery Lich to an opponent who controls no permanents with a phylactery counter on them.
When Phylactery Lich's controller controls no permanents with a phylactery counter on them, Phylactery Lich triggers, causing them to sacrifice it.
However, Phylactery Lich cannot be sacrificed due to Assault Suit.
Phylactery Lich triggers again, creating a mandatory infinite loop that causes the game to end in a draw.

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