Guaiwu Amalgamation

Human creatures you control become Mutant creatures until end of turn.
"The Empire of Jiangshi was once superstitious of the
defiled, gray monsters that lived in the swamps of
Guaiwu. These creatures, despite their horrid
appearance, were not demons; but mutated former
citizens of the Jiangshi empire.. both criminals and
disgraced families alike. For decades therein, the
Brood of Guaiwu was embraced by Jiangshi and
were stronger for it." - Matteus, the Fabulist