Shiera of the Shroud

Flying, Ward - Pay 5 life
Whenever Shiera of the Shroud enters the battlefield or deals combat damage to a player,
put a shadow counter on up to one other target creature.
{u}{b}{r}, Sacrifice Shiera of the Shroud: exile all creatures with one or more shadow tokens, then
create a token copy of each creature exiled this
way under your control, except they have base
power and toughness 1/1 and are shades in
addition to their other types.