Spellbinder + Final Fortune + Sundial of the Infinite

Spellbinder

Final Fortune

Sundial of the Infinite

How it works

1. Deal combat damage to a player with the equipped creature.
2. Spellbinder's second ability triggers, allowing you to cast a copy of Final Fortune without paying its mana cost.
3. The Final Fortune copy resolves, causing you to take an extra turn after this one and creating a delayed triggered ability that will cause you to lose the game at the end of that turn.
4. Repeat steps 1 to 3 on your next extra turn.
5. At the beginning of your end step, a delayed triggered ability from Final Fortune triggers.
6. In response, activate Sundial of the Infinite by paying 1 and tapping it, exiling that ability and ending the turn.
7. Repeat from step 4 each turn.