Resolute Horseman

Haste, vigilance
Adamant— If at least three mana of a single
color was spent to cast this spell, Resolute
Horseman becomes that color until end of turn.
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Thy knights of deep, thy knights of old, evil dost creep
among the black mold. So in truth thine fight, to
further thine light, for that tis' the way of thine knight.
—A Jolly Tavern Song