Magar of the Magic Strings + Last Chance + Glorious End

Cast Last Chance by paying its mana cost, causing you to take an extra turn after this one and to lose the game at the beginning of that turn's end step.

Activate Magar by paying , noting Last Chance and putting it face down on the battlefield as a 3/3 creature.

Activate Magar by paying , noting Glorious End and putting it face down on the battlefield as a 3/3 creature.

During your next turn, deal combat damage to an opponent using the face down creatures that have Last Chance and Glorious End noted

The creatures trigger.

Resolve the first trigger, casting a copy of Last Chance without paying its mana cost

Resolve the copy, causing you to take an extra turn after this one and to lose the game at the beginning of that turn's end step.

Resolve the second trigger, casting a copy of Glorious End without paying its mana cost

Resolve the copy, causing you to end the turn

This will prevent the Last Chance trigger from causing you to lose the game.

Repeat from step 3.