They were introduced in Innistrad, and were all cards played on one side that later transformed into the other
Get this and try it out I think you'll be gently surprised at how good it plays
The first of these cooperative battlers is subtitled Deep Trouble, and it seems as though we can expect a series of these PvE-style releases in future sets
Once these decks have a dredge engine going they tend to dredge several cards to increase the number of threats, or they might go for a finisher with cards like Dread Return and Flame-Kin Zealot
Plot only as a sorcery.) P/T Number 152 Language English Legal Formats Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pioneer, Standard, Timeless, Vintage Not Legal Formats Alchemy, Pauper Rulings (4/12/2024) Plot abilities are written "Plot [cost]," which means "Any time you have priority during your main phase while the stack is empty, you may pay [cost] and exile this card from your hand
Conjure a duplicate of the top card of their library into your hand