It ETBs with energy, sure, but it can convert energy to creatures without tapping, which, of course, means you can generate infinite tokens pretty easily with the other cards here
Like in a normal draft, you want to draft intrinsically powerful cards that demand an answer from your opponent and cards that will answer your opponents' cards
Mysidian Elder Rating: 4/10 These black mage tokens are going to be very valuable in the black/red deck, and Mysidian Elder is a pretty decent way to get one
The more desirable cards a specific booster box has from the Reserved List, the more its value is likely to grow over time
Start out with Armix after dropping cheap protection in the form of Lightning Greaves, Swiftfoot Boots or (my favorite) Welding Jar