Mardu Siegebreaker + Éomer, Marshal of Rohan

Prerequisites

• An opponent cannot block and kill Mardu Siegebreaker.
• You have two or more opponents.

Steps

1. 1Declare Mardu Siegebreaker as an attacker, triggering its second ability, creating at least two token copies of Éomer that is tapped and attacking.
2. 2Put all but one Éomer token into your graveyard due to the legend rule.
3. 3When the Éomer token(s) die, you will get at least one Éomer trigger, causing you to untap all creatures you control and to get an additional combat phase after this one.
4. 4Repeat each combat phase.

Effects

• Infinite combat phases
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mana creatures you control can produce
• Infinite untap of creatures you control