This little cleric does a lot of things at a small cost. If you're in the business of making tokens, then it will be really easy to utilize all of these abilities for maximum effect.
Start with a target player losing 2 life, which doesn't seem much at first. you'll find that if you're able to stack at least three to four of those, then lifedrain quickly stacks
After that, an opponent needs to sacrifice a creature. If they aren't playing any tokens, then it's going to be really hard for them to give up any of their threats.
Lastly, you get to draw a card and add 2 black mana to your pool, which may let you cast another Priest or a cheap spell.