Sedresni, Caller of Graves

If Sedresni, Caller of Graves is in the Command
Zone, all Zombies you control gain +2/+1.
All Zombies you control gain Protection from
White and +1/+1.
{x}: Target Creature with CMC equal to {x} from a graveyard enters the battlefield. It is a
Zombie in addition to it's other types.
{x}{t}: Gain 2 life for {x} amount of Zombies you control