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To represent his nature as gatekeeper to the horrific creatures of the Undermountain, Durnan allows players to exile a creature from the top of their deck when they attack, and then reduce its cost by three

However, in the right decks, this tradeoff of life for cards can be worth it to ensure you draw your best cards

If its a permanent card, they put it onto the battlefield

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Its also worth mentioning Hour of Reckoning here because that ups the count of extremely one-sided wipes to three, potentially more depending on board state

When you cast a mana spell in your archetype more than your experience counter count you'll get one, and your spells you are built around cost that much fewer