C'mon, Wizards
Double-faced cards that can be cast on either side are MDFCs, or modal double-faced cards, which don't use the transform mechanic
In addition to these new commanders, Wizards of the Coast has also introduced a new mechanic called "Partner" in Commander 2016, which allows players the ability to have two commanders if both have the "Partner" mechanic, as seen below with two cards from the "Invent Superiority" deck
In the last four weeks, I looked at the top hundred cards for multiplayer of all time
The beautiful thing about it is that the counters continue to stack even after it becomes a creature, meaning that 8/8 can turn into a 14/14 if you play your cards right
The fact she can also tap for two colourless and put counters on your creatures makes her a highly flexibly and all-round great new commander for not just the Tyranids here, but the many Hydras found in mainstream Magic