From what I gathered, several programs let you design Magic cards, but Magic Set Editor can be used to create entire sets
Not to worry, though the real meat and potatoes of this set are found in the boosters
It has a whole slew of ways to trigger life gain, whether through a Soul Sisters strategy that lets your creatures cause you to gain life when entering or by granting life gain or even through limited-use alternate triggers
Dionus, Elvish Archdruid Dionus, Elvish Archdruid warrants a mention considering how easy it is to tap elves, be it with cards like Heritage Druid or with something like Cryptolith Rite
The deck would be different if you decided to add in some counters or bounce spells or something, but it might be better at your tables
Six mana for a 4/4 with lifelink that also reanimates your biggest, baddest monster and then gives it lifelink is a door-crasher deal