You may play any card or cast any spell during either of your main phases
Enchantment - Aura Smoke Spirits' Aid For each of up to X target creatures, create a red Aura enchantment token named Smoke Blessing attached to that creature
Our goal is to cast Volrath, put counters on all the creatures we're turning into with Volrath, and then having a fun time shapeshifting into the best creature for value or straight-up combo victory
Rise to the Challenge Zendikar Rising takes us back to Zendikar, recapturing the spirit of exploration and adventure that made it one of the game's favorite worlds
There are a number of resources out there that allow you to plug in your decklist and get a breakdown of what percentage of your cards need specific colors of mana, what the average converted mana cost of your cards is, and other helpful information (Im partial to Tapped Out personally)
As an opponent, its another thing you must decide if you can afford to play around
