Calls of the Columbary

When Calls of the Columbary enters the
battlefield, exile all creatures.
At the start of each player's turn, they may
return a creature exiled with Calls of the
Columbary to the battlefield tapped under its
owners' control. If they do, you draw a card
and gain 3 life.
The caws and chirps of hundreds of birds echoed
through the witch's castle.