These decks are the best at exploiting the legendary artifact, by either bouncing it with Teferi, Time Raveler, grabbing it from the sideboard with Karn, the Great Creator, combining it with a huge number of free pitch spells, and/or looping multiple copies with Emry, Lurker of the Loch
In general, this requires a minimum of sixty cards in the deck, and, except for basic land cards and cards that have text superseding this rule, no more than four cards of the same named card
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the Eye of Vecna, the Hand of Vecna, and the Book of Vile Darkness itself
The payoff of counters makes your board a force to be reckoned with
When you build decks in a Draft or Sealed event, you typically rely on basic landslike Plains, Islands, Swamps, Mountains, or Foreststhat the event organizer provides in unlimited quantities