Quest Zoo Priest

My take on a Quest Zoo build for Priest.

What I'm interested in testing:

1) Does this deck need Ornery Tortoise?

2) Is Siamat as good in this deck? Or should he be replaced with Lady in White?

3) Is Psychopomp good enough as a one-of, or should there really be two?

4) Does this deck need more early game removal?

5) Is a 21-creature base for a Priest Zoo deck enough, too much, or just right?

Most likely cuts: Ornery Tortoise, Siamat

Most likely adds: Shadow Word: Pain, Shadow Word: Death, Lady in White