Each deck can have one or two Ink colors, so I imagine Amethyst will be a popular choice to pair with one of the others, if only for the card draw options
As alluded to, this will be especially devastating if your opponents deck largely revolves around +1/+1 counters
At the beginning of your end step, if eight or more cards are in your graveyard, transform this enchantment
will unleash 100% organic panic as a giant vine threatens the entirety of the realm
With two copies of 002-046-madam-mim-fox, this starter is easier to upgrade to a viable Amethyst Steel deck for tournaments
By making them both uncommons that green-black was happy to play, the cost to put them in your deck was low enough that you'd take them both, and then it's time to Ragnarok and roll