Random deck challenge generator

Two color pairs use the ten guild names: Azorius, Dimir, Rakdos, Gruul, Selesnya, Orzhov, Izzet, Golgari, Boros and Simic. Three color sets use the shards and wedges: Bant, Esper, Grixis, Jund, Naya, Abzan, Jeskai, Sultai, Mardu and Temur. Four color sets are named after the Nephilim, and all five is simply Five Color.

Because it moves you out of the cards you always reach for. A restriction like no creatures or every card with a different name forces a different answer to the same problem, and that is where most deckbuilding ideas come from. It is also the fastest way to turn a pile of leftover cards into a game.

No. It gives you the constraints and you do the building, which is the part that is worth doing. Take the result to the deckbuilder and see how far the collection you already own gets you.