Maybe replace Mystery Gift with Buddy in a Box and make Mystery Gift give a random passive instead?
Lil' Spewer could be added too, using creep in this game could work.
Punching Bag as a defensive familiar with some decent durability, and attracting enemies similarly to Sweet Potato from PvZ2?
Holy Water working similarly to BBF but instead it drops a puddle of damaging creep in a 3x3 area?