They change only the total cost you pay to cast spells or plot cards from the appropriate zones
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Could it win you games from your Mystery Booster 2 draft, absolutely, but including it in other decks is more of a flavor choice
However, it requires a bit of setup
Although your opponent gets to put something out too, youre usually dropping an Emrakul or an Omniscience that ends the game before they can use their new toy
If you like decks with lots of cool combos and card interactions, and you don't mind mixing it up on the battlefield with your opponents, then this might be the starter deck for you