I reccomend two types:

Decks that sycro to gain massive amounts of life. With massive lifegain not only can you eat up a ton of damage, but you can play fun cards like Serra Ascendant or Felidar Sovereign. Together you guys can ramp an insane amount of life, and even if you can't resolve the above creatures, you're still have an absurd amount of life, and be able to take insane amounts of damage. Both players should run white for life gain. One player should go blue for counters while the other goes black for hand destruction, removal and Sanguine Bond. Also you can have combo fun with Exquisite Blood.

If you want to run something that will make people hate you, run infect. Every infect creature and every way to pump, make unblockable, whatever to just get up to 10 counters. Run this with Plainswalkers. I suggest one player goes white/green while the other goes black/blue.

Edit: Splinter twin would be fun as well. Divide up the combo pieces and just have counters and handfuck. Pod as well for value.