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
Unless you count Biorhythm, which really should be legal given the set-up required to kill someone
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
Its great in a deck with +1/+1 counters to spare, but dont rely on its training ability alone to get those counters (speaking towards EDH, at least)
This list really needs it for the scaling
Start out with Armix after dropping cheap protection in the form of Lightning Greaves, Swiftfoot Boots or (my favorite) Welding Jar