Yes but in survival, the amount of places it is SOLD for very cheap, and how crazy it spreads that I didn't add it.
I don't think emeralds are that hard to obtain I got 13 whilst mining last time and /warp zrinne sells them for like $20 each I think
All except for the first three aren't too bad to find, and then beacons you can find in auctions for 500-700. Sponges you can get for less tokens than dragon eggs so I would say dragon eggs are the most difficult, with them taking 25 days of voting to get.
Definitally dragon eggs. Costs over 7k to buy from someone, or 25 days of voting. SO much trouble to get one, plus you cannot obtain one without buying ;-;