It makes removal part of your game plan and that alone is powerful
Its a blinkable/recursive tutor for small creatures, including combo pieces like Painter's Servant
Meanwhile, Frost Titan is really annoying to play against since it can keep tapping down a permanent (usually either a blocker, so we can force through more damage, or a land, to disrupt our opponent's plays) and because it's difficult to kill since it costs two extra mana for the opponent to target it
There also seems to be a treasures sub-theme which I do not think is very well supported, so it will not come up in every Red-Green deck
The loss of life Jerren causes isn't exactly optimal, but you can easily offset this downside for two mana, Jerren can provide a target Human with lifelink until the end of the turn
This deal almost brings the Play Booster Box to its TCGplayer market price