While youll need to be wary of artifact removal, Black Crystal should fit nicely into the majority of black decks in Commander
If a card with dredge is in your graveyard, and you would draw a card for any reason, you may instead return the card with dredge to your hand by putting a number of cards equal to the dredge number from your library into your graveyard
Whenever Calix or an enchanted creature you control deals combat damage to a player, you may create a token thats a copy of a nonlegendary enchantment you control
You can hop into a discussion about bulk cards with like-minded players on the Draftsim Discord
For more information, check out the Wilds of Eldraine Mechanics article
One of the main reasons I shop Playasia over Amazon Japan is that you often have to buy from third-party sellers for most sets, and while you can find reputable and good sellers on Amazon, I personally feel more comfortable buying from a retailer whenever I can