A card like Blighted Cataract is colorless in game, but has a blue color identity, and we're focusing on cards that could be played in a colorless Commander deck
The first is the Gold and Silver part, this is in direct relation to the Pokmon Gold and Silver games that were the second generation of games released for series
A great starting point is Kogas Rental Deck, which includes cards like Grimer and Arbok
Goad is a powerful mechanic and can help you win games quickly when other players are busy attacking each other, because thats what youve saddled them up with
A card like [mtg_card]Satyr Wayfinder[/mtg_card] (included in the precon) is a great example of what shes looking for: it has a good ETB trigger, it dumps new cards into your graveyard, its not a loss to sacrifice it, and it has a low mana cost, so you can start bringing it back right away