Altaxa, Astral Warlord

Flash, Double Strike, Wither, Lifelink
{u}{u}{u}, {t}: Gain control of target creature. It is
an Astral in addition to its other types.
{r/w}: target Astral creature gains First Strike until
end of turn.
{r/w}{r/w}: Target Astral creature with First Strike
gets Double Strike until end of turn.