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

Draw the game

Jon Irenicus, Shattered One

Kukemssa Serpent

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

Combos with "Kukemssa Serpent"