Spell Mastery isn't any easier to get than delirium and it is a touch narrower too
The most common of these is Akromas Memorial, a Commander staple that will give most creature-based decks a leg up in combat
Swift Demise I count Swift Demise because it would work with many alpha strikes (yours or your opponent's), but more importantly pairs up beautifully with cards that spread one damage to all your opponent's creatures like Iroh's Demonstration and End the Festivities
Emerald Sapphire is all about Inventors, and when characters with that keyword enter the mix youll want to compliment them with Support characters, Locations, and Items that allow you take full advantage
Planechase is back too, so each deck has a number of brand new plane cards
Introducing Morph: Onslaught, Legions, and Scourge Morph first appeared in Onslaught , Legions and Scourge