Dovah'kiin

Ward {x}
Dovah'kiin enters the battlefield with X +1/+1 counters on it and gets an additional +1/+1 for
each {g} spent to cast it.
{3}{b/g}{b/g}{t}; destroy up to one target dragon an
opponent controls
{3}{w/u}{w/u}{t}; gain control of target dragon an
opponent controls.