Here are some others that help the deck: Rescue Rabbit with Evilswarm Heliotrope (1 rabbit, 3 heliotrope) -allows for easier Xyz plays and only costs one card -Heliotrope has high atk (1950) Dark Armed Dragon (only allowed 1 copy) -good removal -most monsters you would run in the deck are dark -Kerykeion makes amount of darks in graveyard manageable Evilswram Mandragora (1-2 copies) -easy to summon -allows for Xyz plays even if you didn't draw into Castor or Rabbit Evilswarm Thunderbird (2-3 copies) -is easy to protect to save for Xyz summons -has decent atk after you use it's effect (1950) Cards that negate monster effects (Effect Veiler, Fiendish Chain, Breakthrough Skill, etc.) -pandemic protects from spell and traps but monster effects still work ROTA (reinforcement of the army) (only allowed one copy) -searches for Castor Evilswarm Bahamut (1-2 copies) -other option besides Ophion -steals opponent's monsters Number 66: Master Key Beetle (1 copy) -protects cards from destruction Safe Zone (1-2 copies) -protects Ophion -if Safe Zone is going to destroy your monster you can use Pandemic to protect it Rescue Rabbit with Evilswarm Heliotrope (1 rabbit, 3 heliotrope) -allows for easier Xyz plays and only costs one card -Heliotrope has high atk (1950) Dark Armed Dragon (only allowed 1 copy) -good removal -most monsters you would run in the deck are dark -Kerykeion makes amount of darks in graveyard manageable Evilswram Mandragora (1-2 copies) -easy to summon -allows for Xyz plays even if you didn't draw into Castor or Rabbit Evilswarm Thunderbird (2-3 copies) -is easy to protect to save for Xyz summons -has decent atk after you use it's effect (1950) Cards that negate monster effects (Effect Veiler, Fiendish Chain, Breakthrough Skill, etc.) -pandemic protects from spell and traps but monster effects still work ROTA (reinforcement of the army) (only allowed one copy) -searches for Castor Evilswarm Bahamut (1-2 copies) -other option besides Ophion -steals opponent's monsters Number 66: Master Key Beetle (1 copy) -protects cards from destruction Safe Zone (1-2 copies) -protects Ophion -if Safe Zone is going to destroy your monster you can use Pandemic to protect it

Some of these make a bit of sense given a total reset of the store and updated avatar, but completely losing a players friend list will likely mean losing connections formed and maintained solely within Pokmon TCG Online
At such a low cost, Wrenn and Six does so much out of the gate, and this isn't even including her game-breaking ultimate, which gives all your instant and sorcery spells retrace
But you know what they say about "almost"