Current cards I have in play:
Forest x2
Eladamri's Vineyard
Vernal Bloom
Groundskeeper
Untap, upkeep, draw. 4 cards in hand.
Use G from Vineyard to play Fastbond.
Play Zuran Orb.
Tap Forest for GG.
Sacrifice Forest to Zuran Orb to gain 2 life.
Use GG to return Forest to hand via Groundskeeper.
Play Forest again for 1 life.
Net cycle gain: 1 life.
I'll do that 9,999,980 times to be at 10,000,000 life.
Let's see, 2 cards in hand. Whoops! Didn't play my free Forest.
Tap two Forests to play a second Vernal Bloom. All Forests now produce GGG.
Tap Forest for GGG.
Sacrifice Forest to Zuran Orb to gain 2 life.
Use GG to return Forest to hand via Groundskeeper.
Play Forest again for 1 life.
Net cycle gain: G and 1 life.
I'll repeat the procedure 40 times, and play the final card in my hand: Hurricane. For 40. (40xG + G left over from Vineyard)
Good game. Next?
(Also note that I DID stick to one color, everything I did is within the parameters of the game, and since nobody is playing blue, nobody can counterspell. And if you want to burn my Groundskeeper or destroy my Zuran Orb, I'll simply do my cycles in response to that.)