This is a good stuff cube. The archetypes are as follows: UR Spells, WB Sacrifice, UG Miracle Grow, GB Graveyard, WR Tokens. You will often yourself with more then enough playables so you should evaluate card's individual power. There are signets and other forms of fixing and you will find you can play the ally color pairs but there will be less synergy then the enemy colored archetypes. If you are debating between a card that has potential for a lot of synergy in your deck vs. a much better card individually, it is usually better to chose the better card unless you are all in on your archetype.