Cast Warrior's Oath 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 {1}{B}{R}, noting Warrior's Oath 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 creature that has Warrior's Oath noted.
The creature triggers, casting a copy of Warrior's Oath 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.
Activate Sundial of the Infinite by paying {1} and tapping it, causing you to end the turn. This will prevent the Warrior's Oath trigger from causing you to lose the game.
Repeat from step 3.

Infinite turns

Magar of the Magic Strings

Sundial of the Infinite

Warrior's Oath

Cast Warrior's Oath by paying {R}{R}.
Exalted Flamer of Tzeentch's second ability triggers, dealing 1 damage to each opponent.
Resolve Warrior's Oath, causing you to take an extra turn after this one.
Move to your extra turn.
At the beginning of your upkeep, Exalted Flamer of Tzeentch's first ability triggers, returning Warrior's Oath from your graveyard to your hand.
Repeat steps 1-3 one additional time.
At the beginning of your end step, Warrior's Oath triggers.
Holding priority, activate Obeka by tapping it, ending the turn and exiling the Warrior's Oath trigger from the stack.
Repeat from step 4.

Obeka, Brute Chronologist

Exalted Flamer of Tzeentch

Cast Warrior's Oath by paying {R}{R}.
Exalted Flamer of Tzeentch's second ability triggers, dealing 1 damage to each opponent.
Resolve Warrior's Oath, causing you to take an extra turn after this one.
Move to your extra turn.
At the beginning of your upkeep, Exalted Flamer of Tzeentch's first ability triggers, returning Warrior's Oath from your graveyard to your hand.
Repeat steps 1-3 one additional time.
At the beginning of your end step, Warrior's Oath triggers.
Holding priority, activate Sundial of the Infinite by paying {1} and tapping it, ending the turn and exiling the Warrior's Oath trigger from the stack.
Repeat from step 4.

Cast Warrior's Oath by paying {R}{R}, causing you to take an extra turn after this one.
Activate Kiki-Jiki by tapping it, creating a token copy of Ardent Elementalist.
The Ardent Elementalist token enters the battlefield, returning Warrior's Oath from your graveyard to your hand.
At the beginning of each extra turn's end step, Warrior's Oath triggers.
Holding priority, activate Sundial of the Infinite by paying {1} and tapping it, ending the turn.
Repeat each turn.

Kiki-Jiki, Mirror Breaker

Ardent Elementalist

Cast Warrior's Oath by paying {R}{R}, causing you to take an extra turn after this one.
Activate Reflection of Kiki-Jiki by paying {1} and tapping it, creating a token copy of Ardent Elementalist.
The Ardent Elementalist token enters the battlefield, returning Warrior's Oath from your graveyard to your hand.
At the beginning of each extra turn's end step, Warrior's Oath triggers.
Holding priority, activate Sundial of the Infinite by paying {1} and tapping it, ending the turn.
Repeat each turn.

Fable of the Mirror-Breaker // Reflection of Kiki-Jiki

Cast Warrior's Oath by paying {R}{R}, causing you to take an extra turn after this one.
Activate Magar by paying {1}{B}{R}, noting Warrior's Oath and putting it face down as a 3/3 creature.
Activate Magar by paying {1}{B}{R}, noting Stunning Reversal and putting it face down as a 3/3 creature.
Move to your next turn.
Deal combat damage to an opponent with both face down creatures, triggering their abilities.
Resolve the first trigger, causing you to cast a copy of Warrior's Oath without paying its mana cost.
Resolve the copy of Warrior's Oath, causing you to take an extra turn after this one.
Resolve the second trigger, causing you to cast a copy of Stunning Reversal without paying its mana cost.
Resolve the copy of Stunning Reversal.
At the beginning of your end step, Warrior's Oath triggers, causing your life total to become one and you to draw seven cards due to Stunning Reversal.
Repeat from step 4.

Stunning Reversal

Cast Peer into the Abyss, drawing at least twelve cards and losing half your life total.
Cast Warrior's Oath, gaining an extra turn.
Activate Aeromeba by discarding a card to switch Aeromeba's power and toughness until end of turn.
Repeat step 3 until you have exactly thirteen cards in your hand.
Pass to the extra turn.
At the beginning of your upkeep, Triskaidekaphile triggers, winning the game.

Combos with "Warrior's Oath"