Verth of the Feather

Flying, protection from black, hexproof
Whenever this creature transforms into Verth of
the Feather, you may tap up to two target black
or werewolf creatures you don't control. Those creatures don't untap during their controller's
next untap step.
At the beginning of each upkeep, if a player cast
two or more spells last turn, transform Verth of
the Feather.
"...slaying the strong by night."