Boros Keyrune (GTC) #227 [EN/N] s/o

{3} · Artifact · {T}: Add {R} or {W}. {R}{W}: This artifact 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.) · Illustrated by Daniel Ljunggren · Gatecrash #227 · EDHREC rank 14777 · Magic: The Gathering, MTG