Sabrina will allow you to pull your opponents Pokmon out if it poses too much of a threat, while X Speed allows you to do the same with yours
To reliably pull off two-spell turns, you'll want a include enough cheap spells and card draw effects
Brotherhood Scribe Sure, tapping for an energy is fun, but Brotherhood Scribe is here because it makes your creatures infinitely big when you get your expected infinite combo, as it triggers off each iteration of energy gain
While we've had dominant decks and cards like Collected Company, Siege Rhino, Pack Rat, and Rally the Ancestors, those formats didn't see huge drops in attendance, and for the most part, by the time the outcry got loud, the problem card was already close to rotation (if you look at Rally and Bant Company, their most dominant times were in the two or three months before they rotated from the format)
However, having looked at the data from Cube Cobra and given feedback on countless new cubes over the years, my personal opinion is that most cubes should include more lands
TCGPlayer Is a Great Place to Buy Cards All Constructed formats have a list of banned cards to help balance out the meta and remove insane combos from their respective formats
