Theros said: Best is DOM. All cards in that set are good and usable. other sets octagon has made are horrendously unplayable except for a few outliers some of which look meta wrapping.2nd best has to be SOIThe worst is RNA. Adapt mechanic is weak. Even energy many regard as lacking is better than adapt for few reasons:Energy creates more energy gems when the same creature is played multiple time or teferi blinked. If I play 2 creatures with energy 2 I get 4 energy gems. On the other hand, playing multiple or blinked copies of an adapt creature does not create additional adapt gems. This is the no 1 limitin factor. All other mechanics in game like void, treasures.. do not act like adapt.