mtg commander master deck Magic The Gathering: Masters: Commander Decks sided tokens Magic: The Gathering Commander Master

The interesting thing about the Duke is that it affects the combat step when it enters, and each creature you cast after that can potentially have haste and myriad (although only one at a time)

Kefnet the Mindful If you have enough mana, remember you can spend 9 mana per turn to loop the synergy of Mystic Sanctuary + Kefnet the Mindful + Time Warp to get infinite extra turns

Its even better in Commander

potentially getting you three extra combats each turn

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