Well, I just made a mostly blue deck that's completely non creature based, it's hideous. Treadwine Prophets + Protective Bubble + Merrow Harbringer = hilarity.
Prophets are "when dealing combat damage to an opponent, you may sacrifice a merfolk. If you do, take an additional turn after this one." Protective Bubble is an aura, creature is unblockable and has shroud. Merrow Harbringer is when it comes into play, search your deck for a merfolk, reveal it, and put it on top of your library. Attack with prophets, sac creature, play harbringer, get another harbringer, rinse repeat. It helps that the Prophets are 4/4's as well. It's hideous. The only real disadvantage is that the Prophets are 4UU (I think?), so it's not the quickest off the bat.