Cold-Water Snapper cant be targeted by spells like Murder or Icy Manipulator, while controlling Leyline of Sanctity prevents you from being targeted by spells like Mind Rot or Shock
Best Green/White Commons in Wilds of Eldraine limited : Cooped Up, Slumbering Keepguard, Curse of the Werefox, Moment of Valor, Troublemaker Ouphe Slumbering Keepguard is probably good in almost any white deck but it really shines here where you have the focus on enchantments letting you scry and becoming a big threat once you have the mana
With Katara out, any triggered ability of any Ally you control will trigger twice
Lets look at Dirty Rat as an example
Youll get 5 of each of the nine basic Energy types Fire, Water, Grass, Lightning, Fighting, Psychic, Dark, Metal, and Fairy
Start free upgrade only if you grade a lot