Overall, Amethyst, Ruby, and Steel are more focused on attacking while Amber, Emerald, and Sapphire are more supportive, but each can be used to make interesting combinations and people can experiment with seeing what strategies work with their personal play style
If you're excited about the upcoming set, why not find some like-minded TCG-enjoyers on the Wargamer Discord?
Though the new cards are currently whats carrying the price of the deck, the reprints here are also very good
If its a nonland card, you instead put a +1/+1 counter on the creature that explored and decide if you want to put the card in your graveyard or leave it on top of your library
Even if you only cast one of them, theyll make for a great creature without truly needing the other one all that badly