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Due to the nature of the construction deck, multiple identical cards are included

By combining Entomb to search for Griselbrand and put it into the graveyard and a plethora of cards such as Animate Dead that return it to play, you can reap the rewards of Griselbrand without having to spend eight mana

Improvisation Capstone Read Improvisation Capstone closely and you'll see that it results in at least one free spell, and the catch is you get at least four mana's worth in case you exile Lightning Bolt, Curse of Opulence, and Underworld Breach, you could cast each of them

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