Yavimaya Elder (Ext, S, Block) A mainstay of The Rock (a black-green deck that thrives off of card-advantage creatures), the Elder potentially nets you a four for one advantage: it can block and kill a creature, then sacrifice to draw a card plus two lands
You can do this at instant speed too, which means you can do it as someone attacks you to suddenly have a horde to defend with
The face commander is Davros, creator of the Daleks
This Rakdos commander allows you to generate Food tokens simply by discarding a card, which you can later use to take down creatures with 6 toughness or less
With the Agate in play, every critters deals one damage to every opponent, then Zinnia creates an offspring and deals one more
I would pick as many as possible to protect my creatures during combat