Starting with Commander 2017, Commander sets are reduced from five to four preconstructed theme decks (without reducing the number of new cards) and will be built around themes instead of focusing on color combinations.[4] The reduction of number of decks comes forth from the idea that the best Commander play experience for a new Commander player is a four-player game.[4]
Commander 2017 features four 100-card decks, with 309 different cards in total. There are 56 new cards legal in Vintage and Legacy. Each of the four decks is tribal themed, based on the “most popular, and interesting, tribes.”[2] Cards from Commander 2017will be featured and distributed in connection with a future offering on Magic Online.
Each preconstructed deck was designed with an identity for each tribe:[5]
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Draconic Domination (“Dragons matter” and ramp)[4]
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Feline Ferocity (“Cats matter” and equipment)[6][4]
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Vampiric Bloodlust (“Vampires matter” and lifegain)[7]
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Arcane Wizardry (“Wizards matter” and graveyard interactions)
Each comes with an oversized foil card that corresponds to the main commander of that deck. This card is for fun only and isn’t required for Commander gameplay.[3]
https://mtg.gamepedia.com/Commander_2017