Ashiok's Violin

Ashiok's Violin is active as long as you control an Ashiok planeswalker.
Each turn, tap target creature. It doesn't untap
during its controller next untap step.
{b}, disables target opponent's Planeswalker
during its controller turn
________________________________________
"While we were hypnotized by that instrument's
music, our enemies continued to take our lives to the
rhythm of the melody."