Its a whole other level of the game, Ive learned, just making these minor adjustments, working out ifsayhaving a Lady card in your deck, that lets you pull four Energies from the deck in one turn, is more efficient than loading up with so much Energy that you can rely on the odds of their landing in your hand
The devotion mechanic has a unique and fun play style that you should play around with if you havent yet
Thalia, Heretic Cathar , on the other hand, just slows your opponents down to a grind because all creatures and nonbasic lands your opponents play have to enter tapped
"The MTG Reserved List, a History"
One of the mechanics showcased in either set, though, did not change