Sugarman, Twisted Geneticist

Menace
{u},{t}: Change the text of target creature by
replacing all instances of one creature type with another until end of turn. The new creature type
can't be Horseman or Wall.
{b}{b}: Target creature blocked by Sugarman,
Twisted Geneticist, loses an ability of your choice
until end of turn. Activate only during
the declare blockers step.