Grimy Mold

When Grimy Mold enters the battlefield, put a
-1/-1 counter on target creature. That creature
cannot attack or block until your next turn.
I was cleaning out my sink one day, when I came
across this greenish-brown sludge...I woke later that
day on the ground, with a very weird taste in my
mouth...
-Yawgmoth, The Lord of the Wastes