Grandmaster has a huge target on his head so he's almost always the first to die. In any case, I played Jeskai tempo where I pretty much want the game to end before getting to 7 lands. His lifelinking spells ability was much more relevant with my sandblast and burn away.
I won multiple games by holding back Soulfire until my opponent used up their removal, then buying back a spell each turn (usually Bathe in Dragonfire).
At one point I had 7 mana, Soulfire, and both Whisk Away and Crippling Chill in hand. As soon as my opponent realized he could no longer attack or block without being locked out of the game, I used Chill instead. Eventually he drew into Mastery of the Unseen which allowed him to spend 4 mana to see new cards even after I Whisked Away each turn. Then he dropped Abzan Ascendancy which made it problematic to trade with or kill his creatures because I was at a very low life total with no fliers. Then he drew Citadel Siege, which might be the best rare in the set. After barely staying at parity for a few turns, and being forced to cast multiple spells without buyback, I drew my sideboarded Erase, and exiled all three of his enchantments. He died a few turns later.
One match I got my opponent to conded when I started casting Crippling Chill with Buyback. I also got to play Sandblast withbuyback but unfortunatly my Grand Master got killed after the first time. Overall tough the lifelink for spells was the more important as I head double Sandblast along with double Cunning Strike.