A very slight diamond cut is allowed
With all of the themed packs being based on Ravnicas guilds, your forty-card deck is basically always going to be split between either three or four colors, but having the right colors of mana was a surprising non-issue in my match
But take the most expensive card in Magic, a Limited Edition Alpha Black Lotus
Others have resisted the horse invasion, inventing cards like 'Horseocalypse', an artifact that can trivially exile all horses, 'Sparricus the Unhorse', a Kirin that synergizes with non-horse creatures, or 'Ketamine', a joke artefact that certainly works in the horse deck but feels rather against the spirit of the thing
One key strategy for using planeswalkers abilities is to protect the card from damage
This is due to the fact that the cards go out of circulation