Donald Trump, the Savior

Protection from non-white creatures.
At the beginning of your upkeep, gain control of target creature you don't control unless you
control 5 or more walls.
{t}:Destroy target blue candidate.
{r}{r}{w}{w}: Create a 0/3 Wall creature token with defender and "When an attacking creature
becomes blocked by this creature, exile it." You
may use lands you don't control to pay for this
ability.