Sylvanas, the Banshee Queen

Reach, Skulk, Ward—Sacrifice a permanent.

Black Arrows — Permanents your opponents control enter the battlefield tapped and with one stun
counter on them. Permanents with triggered or activated abilities that enter the battlefield with a stun counter on it this way has their activated and
triggered abilities countered until Sylvanas, the
Banshee Queen leaves the battlefield. (Mana
abilities can't be countered this way.)