My friend RSR2 and I won 1st place in a two headed giant tournament. We went with the strategy of he gains us life. I disrupt my opponents strategies. And we both had ways of getting rid of creatures. I had a few counter spells.

Black/White RSR2's deck.
4x n** Gwyllion
4x Beckon Apparition
4x Edge of the Divinity
4 x Unmake
4x Voracious Hatchling
1x Deathbringer Liege
4x Soul Reap
3 Recumbent Bliss

1x Fetid Heath
7x Plains
8x Swamps
1x Springjack Pasture

Mono Blue. My deck
4x Slippery Bogle
4x Favor of the Overbeing
4x Snakeform
4x Inside Out
2x Wistful Selkie
1x Cold-eyed Selkie
1x Overbeing of Myth
1x Fable of Wolf and Owl
1x Dominus of Fealty
1x Sanity Grinding
1x Glamerbye
2x Dream Fracture
2x Glen Elendra Archmage

1x Flooded Grove
1x Cascade Bluffs
15 Islands

Where we play a team buys a booster box and then make two deck and then each round is 1 game. Each team has 30 life. And If one person ran out of cards then you both lost. The only problems we had was against decks that has some burn, I didn't have a problems but randall did because Slippery bogle is amazing. I had to use the counter spells as soon as I drew them usually. It was really fun.