There are as many copies of it as there are Shadowspear unless I missed some Event Deck or something, so its very reasonable to buy these at $5 and try to get out at the $20-$25 people want for Shadowspear, a card in fewer decks according to EDHREC
Examine the number fonts, especially the shape of the 5 Authenticate Your BGS Cards with LegitApp If youre unsure whether your BGS-graded card is authentic, LegitApp can help you check it with confidence
Heres a non-comprehensive list of cards that catch my eye with multiple black symbols in their mana costs: Last time around, Mono-Black Devotion didnt actually have a BB-costed two-drop, so its certainly not a requirement to have one, but it would be a nice complement to the deck (especially if we consider were very likely to get at least another playable card with devotion to black)
Gods Hall Guardian is expensive, even casting it with its Foretell cost, so you probably wont see much of it
Sacrificing a land can be bad, but Id expect a green deck to have plenty of spare lands by the time youre recurring this elemental dragon
In this set, we're representing that idea with quest counters, which first appeared in the Zendikar release