Greensleeves [Mystery Booster: Commander Edition]

+2: Create a Giant Badger token. (It's a 1GG 2/2 Badger creature with "Whenever this token blocks, it gets +2/+2 until end of turn.")
−3: Mill three cards. Put all permanent cards from among them into your hand.
−8: Until end of turn, creatures you control have base power and toughness 8/8 and gain trample.
Greensleeves can be your commander.