Oracle

Artifact 

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.)

Tournooi-info

Legal in: Vintage, Legacy, Modern, Commander

Officiele 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.

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