As for the card prices, you may be able to put some extra dollars/pounds onto the prices shown when selling them but they are not massively rare cards so I would personally advise not to sell them for too much
It can be a brick if you draw it without the right support cards, it's summoning condition is highly specific, and it won't stay on the field thanks to its end phase effect being mandatory
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Dusk Mane Necrozma can fulfill a role similar to Origin Forme Palkia: stall in the Active pot while your main attacker gathers Energy and/or evolves on the Bench
Gone are the days of waiting multiple turns to get a Blue-Eyes White Dragon onto the field (although lets face it, Kaiba never did that either)
For example, Zombie + Warrior = Skull knight + Hard armor = Armored Zombie