Mystery Booster 2

Creature — Rabbit Soldier

Buddy list (As this creature enters, if any of its creature types isn't on your buddy list, write one of them on your buddy list.)
Whenever another creature enters the battlefield under your control, put a +1/+1 counter on Champion of the Hareish if one of that creature's creature types is on your buddy list. Otherwise, write one of its creature types on your buddy list.

Champion of the Hareish

Creature — Human

When A Girl and Her Dogs enters the battlefield and at the beginning of your upkeep, create a 1/1 white legendary Dog creature token and name it.
Whenever A Girl and Her Dogs attacks, it gets +1/+1 until end of turn for each legendary creature you control.