Duke Ulder Ravengard + Éomer, Marshal of Rohan

Prerequisites

• Éomer cannot be blocked and killed by an opponent.
• You have at least three opponents.

Steps

1. 1At the beginning of combat, Duke Ulder Ravengard triggers, giving Éomer an additional instance of myriad until end of turn.
2. 2Declare Éomer as an attacker.
3. 3Each instance of Éomer's myriad ability triggers, creating at least two token copies of it tapped and attacking each other opponent.
4. 4Put all Éomer tokens into your graveyard due to the legend rule.
5. 5When the Éomer token(s) die, each Éomer triggers, untapping all creatures you control and causing you to get at least two additional combat phases after this one.
6. 6Repeat from step 2 each combat phase.
7. 7Once you have an arbitrarily high number of combat phases, you may have Duke Ulder Ravengard give myriad to any other creatures you control.

Effects

• Near-infinite combat phases
• Near-infinite death triggers
• Near-infinite ETB
• Near-infinite LTB
• Near-infinite mana creatures you control can produce
• Near-infinite untap of creatures you control