I'm currently playing a black/blue zombies deck which has the potential to more than triple the number of zombies I have on the field.
And make them all fly.
And hexproof.
But that's next to nothing compared to my other pure black deck, where I can have 7/7 to 10/10s out on the second turn. Which prevent you from attacking. And I can summon them from the graveyard again if you kill them. And again, and again, and again...
So yeah, black.
EDIT: I have Slivers deck which has all colors though. I can tap the Slivers for mana of any color (NOT colorless mana mind!) to get [mtg_card=Progenitus] out. Not that I need it though, seeing as my Slivers can get hexproof, haste and flying, loop mana to draw and place all the creatures in my deck on the battlefield. Also, total swing damage is 2048.
What's your life total again?
And make them all fly.
And hexproof.
But that's next to nothing compared to my other pure black deck, where I can have 7/7 to 10/10s out on the second turn. Which prevent you from attacking. And I can summon them from the graveyard again if you kill them. And again, and again, and again...
So yeah, black.
EDIT: I have Slivers deck which has all colors though. I can tap the Slivers for mana of any color (NOT colorless mana mind!) to get [mtg_card=Progenitus] out. Not that I need it though, seeing as my Slivers can get hexproof, haste and flying, loop mana to draw and place all the creatures in my deck on the battlefield. Also, total swing damage is 2048.
What's your life total again?