Remember any lands you tap to use Primal Adversary's ability will still be tapped even if you turn them into creatures, so choose wisely
Some things that may draw you into specific colors are: A really strong rare you're excited about Plenty of "removal" cards that can deal with your opponent's creatures A lot of playable cards in that color A good "mana curve" in that colormeaning lots of creatures of different costs Ideally, the colors you pick will have all four of these criteria, but if two or three of those are true, that's plenty good
Best Draw Hate Enablers and Payoffs Draw hate is a natural payoff by itself, since it serves the purpose of ensuring opponents dont get too carried away with card advantage
Discarding cards to efficiently draw new ones
This isn't a big deal if we're grabbing a lot of cheap mana value creatures and planeswalkers or if we have a lifegain strategy with our deck
Its far from the premier Amethyst Ruby Bounce Control deck though, so keep that in mind