Kelsier, Survivor of Hathsin

{b}{b}{r/g}{r/g}: Destroy target creature you don't
control. Create a colorless Treasure artifact token
with "{t}, Sacrifice this artifact: Add one mana of
any color.", and gain control of target creature
token you don't control.
{r}{r}: Kelsier gains your choice of flying or first
strike until end of turn. Activate this ability only
once each turn.