These special cards can appear in all boosters, and Id expect these to be really valuable due to the popularity of EDH
With those gone, what is there to do
If a spell cast from your graveyard this way would be put into your graveyard, exile it instead.Choose a Background (You can have a Background as a second commander.) P/T Number 72 Language English Legal Formats Commander, Legacy, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Historic, Modern, Pauper, Pioneer, Standard, Timeless Rulings (6/10/2022) Choose a Background is a variant of the partner ability
The only problem is that, unless you have more than ten cards in the trash, this card is simply a counter in hand