The owner of this deck hasn't added a sideboard, they probably should...
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2x Thassa, God of the Sea 2ULegendary Enchantment Creature — God Mythic RareIndestructibleAs long as your devotion to blue is less than five, Thassa isn’t a creature. (Each {U} in the mana costs of permanents you control counts toward your devotion to blue.)At the beginning of your upkeep, scry 1.1{U}: Target creature you control can't be blocked this turn.5/52x Erbos, God of the Dead 3BLegendary Enchantment Creature — God Mythic RareIndestructibleAs long as your devotion to black is less than five, Erebos isn't a creature. (Each {B} in the mana costs of permanents you control counts towards your devotion to black.)Your opponents can't gain life.1{B}, Pay 2 life: Draw a card.5/7
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You know, if you want to work on a sideboard, there's a black card in Theros that costs 1 mana and destroys a black creature. You can put 4 of those in the sideboard to replace Doom Blades just incase that happens.Oh, and good luck getting Thoughtseize now, because they're $25.
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Actually, what about Temple of Deceit when it comes out? It's a Black / Blue Land that may enter tapped, but can scry for you, and is only $5 a peice, not 10.