Building this commander is a nice exercise because youll want to mill opponents, cast low-mana value spells to be able to double spell a lot, along with casting some high-cost spells
Double-faced cards were in the set from the beginning, as they're the most effective way of showing how heroes and villains have big story-related changes, and Sephiroth becoming the one-winged angel was necessary
Again this is dependent on the colour or guild you choose to play, but the standard mana curve is a great guideline for getting started
Ultimately this is two bodies in one card at a reasonable cost and with a whole lot of bonus utility
Yawgmoth, Thran Physician [Sacrifice Engine, Removal & Card Draw] Yawgmoth, Thran Physician turns creatures into cards, removal, and combo fuel