Russell, Traveler's Changeling

{u}: Warlock Main-If opponent controls a non-
Warlock Guardian creature, that creature gets
+2/-2 until end of turn.
{r}: Hunter Main-Gain double strike, Russell,
Traveler's Changeling gets +3/-3 until end of
opponent's next turn.
{4}{u/r}{u/r}: Titan Main-Gain vigilance until end of
turn. Roll a d20. Russell, Traveler's Changeling
gets +X/+X until end of turn.