Chamber of Nightmares

When Chamber of Nightmares enters the battlefield, choose a creature. That creature can't attack or block, and its activated abilities cannot
be activated.
At the beginning of your upkeep, put a -1/-1 counter on the chosen creature.

"I wonder how you shall turn out, hmm? Will you stand tall? Or will you beg me for death?"
-Amlingor, Tekoua castigator