The card itself looks consistent for early game. Reminds me of Shadow Ascendant, except it's has a weak attack and slow to give an immediate stat buff. Although It's nice to have a sticky minion in the early game, I like it.
This is actually better than Haunted Creeper. Instead of getting 2 1/1s when it dies, you get a +1/+1 on a minion and a 1/1 that gives a +1/+1 to a minion when it dies. Haunted creeper was a pretty strong card, but not really in priest so I still have my doubts about zoo priest.