I like that you are trying to introduce old plants into the game. That not only brings good memories, but I think it feels more "natural" to the game.
I also like the idea of @patdk75, hiding itself and dropping its attack to 0, but to compensate that, it should have a pretty good effect or stats.
Maaaaybe... 1 sun - 0/2 - Antihero 4 ?
Would be like a Haunted Pumpking (4/2 in stats for 1 sun) but this downside would be having no attack against zombies, instead of conjuring a zombie.
Plus, you could probably follow up the next turn with a Berry Blast, so that's 8 free damage by turn 2.