Éomer, Marshal of Rohan is a rare Legendary Creature — Human Knight card from The Lord of the Rings: Tales of Middle-earth (LTR), collector number 428. Current market price: $0.67 (foil $1.30), TCGplayer market prices via Scryfall.
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.
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