Legendary Creature — Human Knight
Haste
Whenever one or more other attacking legendary creatures you control die, untap all creatures you control. After this phase, there is an additional combat phase. This ability triggers only once each turn.
4/4
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→ Infinite combat phases, Infinite death triggers, Infinite ETB
→ Near-infinite ETB, Near-infinite LTB, Near-infinite death triggers
→ Infinite combat phases, Infinite death triggers, Infinite ETB
→ Infinite LTB, Infinite ETB, Infinite death triggers
→ Infinite LTB, Infinite ETB, Infinite death triggers
→ Infinite LTB, Infinite ETB, Infinite death triggers
If Éomer, Marshal of Rohan and one or more other attacking legendary creatures you control die at the same time (probably due to combat damage), Éomer, Marshal of Rohan's last ability will trigger.
Notably, Éomer, Marshal of Rohan's triggered ability doesn't give you any additional main phases. This means that you will move directly from the end of combat step of one combat phase to the beginning of combat step of the next one.