Boros Keyrune

Oracle Text

T: Add R or W.

RW: Boros Keyrune becomes a 1/1 red and white Soldier artifact creature with double strike until end of turn. (It deals both first-strike and regular combat damage.)

Card Rulings

4/15/2013 Until the ability that turns the Keyrune into a creature resolves, the Keyrune is colorless.
4/15/2013 Activating the ability that turns the Keyrune into a creature while it’s already a creature will override any effects that set its power and/or toughness to another number, but effects that modify power and/or toughness without directly setting them will still apply.

Additional Information