The owner of this deck hasn't added a sideboard, they probably should...
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Where is your Oath of the Ancient Wood? You can't really do B/G constellation without it.
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Why is that? And what would you suggest cutting for the said card?
Put Blightcaster in Side board and put the card in put 1 Blightcasters in sideboard and then put two Doomwake Giant in side board to put 3 Oath of the Ancient Woods. Oath of the ancient wood builds your decks power by making your creature much much bigger.