Ranni, Witch of Chill Night

Shroud, soulbond
As long as Ranni, Witch of Chill Night is paired
with another creature, both creatures have Deathtouch and "Whenever this creature deals
combat damage to a player, tap target creature
that player controls. It doesn't untap during its controller's next untap step."
"My order will not be of gold, but of the stars and
moon, and chill night."