Magar of the Magic Strings + Sundial of the Infinite + Last Chance

Prerequisites

• An opponent cannot block creatures you control.

Steps

1. 1Cast 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.
2. 2Activate Magar by paying , noting Last Chance and putting it face down on the battlefield as a 3/3 creature.
3. 3During your next turn, deal combat damage to an opponent using the face down creature that has Last Chance noted.
4. 4The creature triggers, 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.
5. 5Activate Sundial of the Infinite by paying and tapping it, causing you to end the turn. This will prevent the Last Chance trigger from causing you to lose the game.
6. 6Repeat from step 3.

Effects

• Infinite turns
• Lock