Donald Trump, the Savior

Protection from non white creatures.
At the beginning of your upkeep, gain control of target creature 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 another player's lands to activate
this ability.