Professor X, Krakoa Founder

Mutant spells you cast cost {1} less to play.
(This effect can not lower the cost below {1})
{u}, {t}: Untap target mutant you control.
{b}{b}{b}: Destroy target non-mutant creature with
power less than Professor X, Krakoa Founder.
Paragon — If Professor X, Krakoa Founder is
your commander, his color identity is {w}, {u}, {b}, {r}, {g}.