Éomer, Marshal of Rohan (The Lord of the Rings: Tales of Middle-earth #571)

Legendary Creature — Human Knight - {2}{R}{R}
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
„"Need brooks no delay, yet late is better than never."“