First their is ranked play, which is essentially exactly as the standard non-ranked play except that it tracks your progress in a ranking system made up of various tiers ranging from Bronze all the way to Mythic, with many levels in-between
That could change as soon as some unforeseen synergies are realized or more cards are printed
Broken Dreams "Powered" Cubes get their name from the inclusion of the Power Nine (Ancestral Recall, Black Lotus, Mox Pearl, Mox Sapphire, Mox Jet, Mox Ruby, Mox Emerald, Time Walk, and Timetwister), and other cards of similar power level
With Disa in play, Tortured Existence essentially lets you play Lhurgoyf creature cards from your hand for one mana while also returning a different creature card to your hand
Despite first appearances, the basic mechanics of Magic: The Gathering are very easy to understand