Ignoring summoning sickness on your Wizards helps you dig for whatever answer you need at a given time, or to just refill your hand once you've cast a bunch of spells right before the end of your last opponent's turn
You can only play so many Negates against these red decks, and you cant afford to tap out for a Crackling Drake for a long time if you need to protect against their best end game
So, even attacking with him only him means you'll get access to casting the top five cards of your library
Its two Commander options are Teval, the Balanced Scale, a 4/4 with flying that helps you build your lands from the graveyard and create Zombie Druids, and Kotis, Sibsig Champion, which also brings cards from the graveyard to power himself up
If reanimated, it hits for 7 damage while gaining life, and you can bin it by cycling
There are 121 playtest cards in Mystery Booster Commander Edition